OPEN ACCESS
Review Article
Trauma of the midface
Abstract
Fractures of the midface pose a serious medical problem as for their
complexity, frequency and their socio-economic impact. Interdisciplinary
approaches and up-to-date diagnostic and surgical techniques provide
favorable results in the majority of cases though. Traffic accidents are
the leading cause and male adults in their thirties are affected most
often. Treatment algorithms for nasal bone fractures, maxillary and zygomatic fractures are widely agreed upon whereas trauma to the
frontal sinus and the orbital apex are matter of current debate. Advances
in endoscopic surgery and limitations of evidence based gain of knowledge are matters that are focused on in the corresponding chapter. As
for the fractures of the frontal sinus a strong tendency towards minimized approaches can be seen. Obliteration and cranialization seem
to decrease in numbers. Some critical remarks in terms of high dose
methylprednisolone therapy for traumatic optic nerve injury seem to be
appropriate. Intraoperative cone beam radiographs and preshaped titanium mesh implants for orbital reconstruction are new techniques
and essential aspects in midface traumatology. Fractures of the anterior
skull base with cerebrospinal fluid leaks show very promising results in
endonasal endoscopic repair.
Thomas S. Kühnel1
Torsten E. Reichert2
1 Department of
Otolaryngology, Head & Neck
Surgery, University of
Regensburg, Germany
2 Department of Maxillofacial
Surgery, University of
Regensburg, Germany
Keywords: rhinology, trauma, midface fractures, orbit, ESS
1 Introduction
The present review article on lesions of the midface
places the focus on some important aspects, however,
the description in other contexts remains limited. We tried
to take the incidence of scientific assessment into account as well as the partly controversial discussions in
literature indicating the current interest of our disciplines
in certain topics. The main focus is placed on bony injuries. Lesions of the soft tissue are mentioned only if they
are important for the respective pattern of injury. Of
course, it is very important to treat them appropriately
because even in cases of perfectly reconstructed bony
skeleton, scars may lead to deformities and dysfunctions
that can only be corrected secondarily with significant
difficulties [1], [2].
Trauma of the midface regularly lead to lesions of soft
tissue, teeth, and bony structures of the skull including
the maxilla, the zygomatic bone, the naso-orbital and
naso-ethmoid (NOE) complex as well as supraorbital
structures. Not rarely, those lesions of the midface are
combined with injuries of other parts of the body [3]. Patients with midfacial fractures who do not undergo successful or appropriate treatment may suffer from significant long-term consequences such as disfiguring scars,
bony deformities, or even loss of vision [4]. Relevant
emotional and psychological problems may result from
trauma [5], [6]. The successful treatment and rehabilitation of patients with lesions of the midface requires a
profound knowledge of the anatomy, fractures, and
techniques of osteosynthesis. Additionally, special
knowledge in the field of occlusion, physiology of the eye,
and skull base surgery are essential.
2 Basics of traumatology of the
midface
The etiology of midfacial lesions has changed during the
last three decades and still continues. Patterns of trauma
differ regionally [7], [8]. Disorderly conduct as origin of
midfacial trauma are especially dependent from the region. In the last 10 years, on the one hand increasing
trauma of the midface was observed because of domestic
accidents as consequence of an ageing society in the
western industrial countries, on the other hand, sports
accidents are found more often in younger people [9],
[10].
Injuries of the lateral midface (63%) occur more frequently
than central ones, males are clearly affected more often
than females. There is a peak age in the 2nd and 3rd decade of life. Street accidents occur more often than sports
accidents [8]. In 43% of patients, cranial nerve disorders
are revealed. Sensitivity disorders or the infraorbital nerve
are most often, followed by lesions of the facial nerve
[11].
For midfacial fractures, the fracture should be treated
within the first two weeks. Afterwards the beginning bone
absorption at the fragment surfaces and the beginning
callus formation leads to difficult reposition to the anatomical correct position. After an interval of 2 weeks, the
treatment is considered as delayed and is based on the
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principle of secondary posttraumatic treatment. Primary
care for fractures should be performed as soon as the
general condition of the patient allows therapy. The limiting factor for immediate treatment of the fracture is
mostly not the fracture itself but the patient’s general
condition.
Independent from the severity and the fracture type, the
basis of successful therapy of midfacial fractures is the
restoration of the supporting pillar of the midface, the
bony prominences, the bone cavities (e.g. orbit), and
correct occlusion [12], [13], [14]. Definitive surgical
therapy aims at an exact three-dimensional reconstruction
of the skeletal structures in order to restore the face with
its original width, height, and sagittal projection [13].
Since the introduction of plate osteosynthesis via approaches with optimal overview, the treatment results of
craniofacial fractures have been improved significantly.
For therapy of pediatric trauma, adequate procedures
have to be applied. This means in particular that the extensive detaching of periost from the bone should be
avoided as far as possible because otherwise growth
disturbances might occur. On the other hand, it is a principle for children as well as for adults that the reposition
in cases of relevantly dislocated fractures has the priority.
Greenstick fractures do not require necessarily osteosynthetic stabilization after reposition. Absorbable osteosynthetic material is an alternative to titanium [15].
• The foramina of the cribriform plate where the olfactory
fibres emerge.
• The pathway of the anterior and posterior ethmoid arteries.
• The optic canal.
• The superior orbital fissure with the nerve responsible
for oculomotor functions, that however plays only a
direct role in extreme injuries.
• The infra- und supraorbital foramen with its respective
portions of the trigeminal nerve. Fractures affecting
those foramina indicate surgery based on clinically
apparent hyp- or anesthesia.
2.1 Anatomy
The midface consists of the following bony structures:
nasal bones, lacrimal bone, ethmoid, sphenoid, maxilla,
zygomatic bone, and palatine bone [16]. The mentioned
bones merge to the facial skull in a particular kind of
lightweight construction with typical framework construction and reinforced trajectories (Figure 1). The vertical
trajectories, i.e. the supporting pillars of the midface, are
responsible for transmitting the masticatory forces to the
skull base and the bony structures of the neurocranium
[17]. The first major force line draws from the alveoli of
the frontal teeth and canines via the delineation of the
piriform aperture to the frontal process of the maxilla and
to the frontal bone. The second major force line draws
from the area of the premolars and the first molars via
the zygomatico-alveolar crest to the zygomatic bone and
from there to the frontal bone via the lateral edge of the
orbit. The third major force line draws from the distal
maxillary molars via the maxillary tuberosity and the
pterygoid massif to the skull base [16], [17]. The transversal trajectories of the midface are formed by the
supraorbital and infraorbital bone margins and the alveolar process of the maxilla [18].
The sites where vessels and nerves emerge are of major
importantance in traumatology, as they pose structural
weak points that influence fracture lines. In the area of
the anterior skull base the following foramina are concerned:
Figure 1: Course of the vertical and horizontal trajectories of
the midface
2.2 Classification
Today, fractures are mainly classified based on their radiological presentation. Because of the immediate functional clinical significance, the classification of midfacial
fractures according to Le Fort is still applied and will be
described here. Classifications according to Esher,
Wassmund, Gonty [19] and Ernst take predilection sites
such as the cribriform plate, the sphenoid sinus, the
frontal sinus, and the ethmoid roof into account [20].
However, their importance is continuously decreasing.
In a broader sense, also fractures of neighboring regions
will be described. Those are frontobasal fractures, fractures of the nose and the naso-ethmoid complex, fractures of the orbit and the zygomatic bone and the zygomatic arch, and midfacial fractures such as the various
Le Fort fractures.
Impact to the midface results in typical fracture types due
to the particular anatomical structure and construction
of the facial skull [17]. The classifications based on these
observations allow scientific investigations as well as
statistical assessment and comparison of patient populations.
The best-known classification of midfacial fractures is
the classification according to Le Fort [21] (Figure 2). In
the context of his studies, René Le Fort (a French surgeon,
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Figure 2: Le Fort fractures
1869–1951) identified typical fracture lines in the area
of the midface and the maxilla (Le Fort 1901). These
observations led to a widely acknowledged classification
of midfacial fractures. Fractures may occur uni- or bilaterally or in different combinations.
2.2.1 Le Fort I fracture
The maxilla is separated from the facial skull in a horizontal plane above the teeth apices and the hard palate. The
fracture line extends from the piriform aperture through
the zygomatico-alveolar crest to the maxillary tuberosity
and into the pterygopalatine fossa. From there, the fracture line returns via the dorsal wall of the maxillary sinus
in the medial basal wall of the maxillary sinus to the
aperture. The nasal septum is caudally fractured and often the inferior part of the pterygoid process is separated.
2.2.2 Le Fort II fracture
This type is characterized by a dissociation of the maxilla,
the nasal bones, and the nasal septum from the cranial
skull and from the lateral midface. The fracture line extends from the nasofrontal suture via the fronto-maxillary
suture through the lacrimal bone to the floor of the orbit.
From there, it extends through the infraorbital margin via
the facial wall of the maxillary sinus to the zygomaticoalveolar crest. The further course of the fracture line extends around the maxillary tuberosity into the pterygoid
process, from there through the perpendicular plate of
the palatine bone and the medial wall of the maxillary
sinus via the ethmoid to the medial orbital wall into the
nasion. From the nasion, the fracture goes through the
nasal septum in caudal direction and ends at the posterior
edge of the vomer. The integrity of the orbit is destroyed
in the context of such a pyramidal fracture [16].
2.2.3 Le Fort III fracture
The facial skeleton is separated from the cranial skull.
The fracture line extends from the nasofrontal suture via
the medial wall and the floor of the orbit to the inferior
orbital fissure. From there, is fracture line extends through
the lateral orbital wall to the zygomatico-frontal suture
and through the zygomatic archs. From the nasofrontal
suture, the fracture line draws inside through the ethmoid
and the lamina perpendicularis of the palatine bone to
the pterygopalatine fossa. The pterygoid process is also
fractured and the vomer can be severed at the transition
of the sphenoid bone.
In the context of Le Fort II and III fractures, the cribriform
plate might be injured because of fractures in the area
of the ethmoid bone leading to a possible CSF leak. The
frontal and sphenoid bones may also be affected.
2.3 Approaches
The individual approach depends on the underlying fracture: a transoral approach, transconjunctival incisions,
an intranasal approach, or a transcutaneous approaches
may be appropriate [13], [18] (Figure 3).
The choice of the operative approach to the craniofacial
region and the anterior skull base depends on the location
and the extent of the midfacial lesions. The access is
chosen for optimal overview to facilitate reposition and
osteosynthesis. At the same time, the incisions should
be performed in an esthetically discreet way (e.g. parallel
to skin lines and in consideration of esthetic units) and
include the option of expansion [13]. It is crucial to consider special motor and sensitive conditions of innervation
in the face. Especially in recent times, it is one objective
to avoid extensive transfacial or coronal approaches and
to use less invasive and probably invisible surgical accesses. Those approaches are mainly the transconjunctival and intraoral incisions that are sometimes technically
challenging and need more time than the traditional
transcutaneous and transfacial incisions [13], [22]
(Table 1).
The broad acceptance of rigid endoscopes for visualization of complex anatomical relations, especially in sinus
surgery of inflammatory diseases, led to basic changes
of the approaches and the surgical techniques also in
traumatology. The objective is always to achieve at least
equivalent results of reconstruction with simultaneously
lower morbidity. Hence, today the endonasal endoscopically assisted approach is widely accepted for fractures
of the ethmoid and anterior skull base. Especially in the
context of fractures of the sphenoid sinus, it is nearly
exclusively applied [23].
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Figure 3: Surgical approaches to the midface. The definitions of the incisions are listed in Table 1. Modified according to [13].
Table 1: Surgical approaches to the facial skull, modified according to [13]
Simultaneous, interdisciplinary interventions of a team
of neurosurgeons, rhinosurgeons, and maxillofacial surgeons in cases of extended injuries mostly require an
open approach. The coronal incision is favored because
of its excellent overview and the possibility of gaining
vascularized flaps (galea periost) for reconstruction of
the skull base. A disadvantage is the relatively large sur-
gical trauma, a long scar that may be eye-catching in bald
patients, the risk of sensitivity disturbances at the forehead, and in rare cases alopecia along the incision.
In recent times, transorbital approaches become more
and more important which is described in the paper by
H. Gassner in this issue.
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In exceptional cases, the subcranial approach is justified.
It provides a good overview of the anterior skull base and
helps avoiding trephination if a fracture can be treated
in an extracranial, extradural way. It has its main importance, however, in tumor surgery. If this approach is not
pursued via a coronal incision but via a combined bilateral
incision developed by Killian via the nose bridge, an unpleasant scar results (incision according to Siebenmann).
The approach according to Killian is used for naso-ethmoid fractures if the coronal incision is not possible and
transconjunctival approaches do not lead to sufficient
overview. It is not needed to approach the ethmoid and
the sphenoid sinus.
2.4 Symptoms
Clinical evidence of fractures are sensitivity loss of the
skin, step deformity, diplopia, emphysema, epistaxis, and
hyposphagma. In two third of cases with symptom of a
black eye, a fracture is found in the CT scan [24].
In a prospective study of 2,262 patients, Yadav et al. investigated the predictive value of 6 clinical symptoms in
order to evaluate the indication for CT diagnostics. Among
the symptoms that were all weighted equally the following
were found: flexible rim of the orbit, periorbital emphysema, subconjunctival bleeding, pain when moving
the eye, motility impairment, and epistaxis. Only in 15.9%
of patients with blunt trauma of the orbit, a treatmentworthy fracture was found. Patients who had none of the
6 symptoms, however had radiologically confirmed fractures in 6.3% [25].
Epistaxis is a regular symptom of facial injuries caused
by forces from the frontal direction. Diffuse bleedings
from the nasal mucosa or bleedings from circumscript
lacerations of the mucosa can typically be treated by
conservative measures such as packing or bipolar electrocoagulation under local anesthesia. Lacerations of the
piriform aperture and the caudal septal mucosa occur
frequently and may lead to significant bleeding from the
nose. The afferent vessels can be attributed to the area
of distribution of the facial artery on the one hand and
on the other hand to the ethmoid artery. Threatening
bleedings from the dorsal parts of the nose originate from
the external carotid artery and concern the terminal
branches of the sphenopalatine artery. Bleeding events
in the context of midfacial injuries may not only occur
immediately but also after significant time intervals. Late
vascular complications are described by Newman et al.
in 1–11% after blunt facial trauma [26]. If severe epistaxis
occurs even several years after injury of the cranial skull,
it may be a first sign of a covered aneurysm [20]. In the
context of Le Fort II and III fractures, there is a high risk
of blunt carotid artery lesion. Regarding those (and other
high risk) injuries, Biffl et al. revealed in 41% of 249 patients a vascular involvement and recommended specific
diagnostics [27]. Those diagnostic measures consist of
contrast enhanced CT scans, MR angiography, or catheterangiographic procedures [28], [29], [30]. Fractures that
extend through the canal of the carotid artery may lead
to pseudoaneurysm, dissection of the vascular wall,
thrombosis with consecutive blindness or stroke, and
carotid cavernous sinus fistulas [31], [32]. Malposition
of the eye and pulsating exophthalmos are clinical signs
of carotid cavernous sinus fistulas [33], [34], [35]. In rare
cases, pressure-induced paresis of the abducens nerve
may occur [36]. The therapy consists of radiological intervention and depends in detail on the size of the hole that
connects the internal carotid artery in is cavernous segment with the cavernous sinus. Small holes are closed
with coils, larger ones with endoluminal balloons. In a
series of 32 patients, Malan and co-authors could preserve the ipsilateral internal carotid artery in 66% [31].
Intraorbital vascular lesions may be the reason for an
orbital compartment syndrome (see also chapter on
traumatic neuropathy of the cranial nerves). They appear
iatrogenous after ophthalmological, rhinological surgeries
and after traumas. Beside the relief surgeries of the orbit,
pressure reducing measures are performed and the
drainage via catheters is recommended [37]. The concerned blood vessels are mostly part of the choroid blood
supply that is fed by the ophthalmic artery. Rupture of
the ophthalmic artery is very rare and can only be found
in most severe midfacial injuries. It is always associated
with blindness.
Bleedings from the internal carotid artery may be fatal.
If a severely traumatized patient receives help in time,
packing is indicated. The effort may be undertaken to
reduce the blood flow by temporary pressure from exterior
at the neck. Catheter angiography with endoluminal occlusion will follow.
2.5 Radiological diagnostics
Conventional radiological procedures do no longer play
a relevant role in the imaging diagnostics of factures of
the facial skull [38].
More than one fracture was found 33.9% of 1,144 patients with midfacial fractures by Büttner et al. The
courses of the fractures were mainly located in the lateral
midface. Mandibular fractures are usually associated
with other bony lesions. Isolated fractures of the mandible, however, were only found in 1% of cases in the
context of this investigation.
The indication to perform CT scan in low-grade craniocerebral injuries (definition of low-grade cranio-cerebral
injuries: unconsciousness, amnesia or disorientation, and
a score of 13–15 on the Glasgow Coma Scale) is discussed controversially and the management is heterogeneous. There is a clear tendency to extend CT diagnosis
although only rarely treatment-worthy neurological deficits
are observed in this patient group. The “Canadian CT
Head Rule for patients with minor head injury” proposes
reasonable indications. High risk patients are characterized by the following symptoms and should receive CT
scan: less than a score of 15 on the Glasgow Coma Scale
2 hours after the event, suspected open or impressed
fracture of the skull, clinical signs of skull base lesion,
vomiting (more than twice), age of 65 years or older. A
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moderate risk of cerebral lesion is expected in case of
the following symptoms: retrograde amnesia of more than
30 minutes, dangerous mechanisms of the accident
(those are for example the collision of a pedestrian with
a car, fall from a height of more than one meter, and being ejected out of a car) [38].
Patients having had an accident always receive cranial
CT scan (CCT) in the emergency unit if a skull lesion must
be considered. 12% of those cases also suffer from midfacial fractures. Only in 16% these lesions are satisfactorily assessed in that way that in the further course of
treatment no additional CT scan is necessary. So it is
appropriate to indicate also CT scan of the midface during
initial imaging diagnostics in order to avoid later time and
cost intensive diagnostic procedures [39].
2.6 Principles of surgical treatment
The surgical reposition of fractures and osteosynthesis
of patients with midfacial fractures is typically performed
under general anesthesia. Only a closed nasal bone reposition or the treatment of an isolated zygomatic bone
fracture can sometimes be performed under local anesthesia, if needed with sedation [40], [41], [42].
For therapy of central midfacial fractures with fractures
in the area of the nasal skeleton and the mandible with
teeth, the decision where to place the tube for intubation
anesthesia may be difficult [13], [43]. On the one hand,
the nose has to be freely accessible for reposition, on the
other hand the control of occlusion is essential for correct
reposition of the mandible. Often a mandibulo-maxillary
fixation is performed at least for the duration of surgery
in order to secure the occlusion. So it may be necessary
to change the position of the tube during surgery from a
nasal to an oral position or vice-versa. Other possibilities
consist of positioning the tube behind the teeth or perhaps even through dental gaps, to create a submental
exit, or to initially perform tracheostomy [13], [44], [45],
[46].
The treatment of a patient’s fracture with a midfacial
trauma is usually performed in supine position [22]. In
cases of intraoperative navigation, fixation of the head
may be necessary [47]. For intraoperative radiological
diagnostics, the application of a carbon head cup is recommended.
In the context of surgical therapy of midfacial fractures,
standard surgery sets are used. They are completed by
specific osteosynthetic material [13], [48]. It consists of
typical mini- and micro-plates of different shapes with
according osteosynthesis screws of different length [49].
The plates and screws consist of titanium and are stored
in sets that can be re-sterilized. Beside the traditional
plates, also titanium meshes or pre-shaped plates such
as the 3D titanium orbital plate are applied in special
cases [24], [25]. Especially for the reconstruction of the
orbital floor, also other alloplastic material as polydioxanone (PDS) or porous polyethylene are applied [50]. Absorbable osteosynthetic material is used in children be-
cause of possible growth disturbances and migration of
the plates [19].
For naso-ethmoid fractures, absorbable materials are not
established up to now. There is currently no literature allowing a comparison to titanium systems. In pediatric
fractures they are applied in selected cases [51]. The
arguments against absorbable materials are well known
and yet undisputed: The material thickness is too high in
the central midface, the infectious rate is higher compared to titanium, and the duration of surgery is longer
[49], [52], [53].
Generally, the bone fragments should be repositioned in
their anatomically correct position and secured safely.
The objective is the reconstruction of the shape and
function of all structures of the midface, as atraumatic
as possible [12], [13], [14].
The reconstruction of the correct occlusion is one of the
most important objectives of surgical treatment of midfacial fractures affecting the teeth-bearing parts of the
midface [54]. Hence, in many cases at least a temporary
mandibulo-maxillary fixation (MMF) via orthodontic archwire plastic splints or MMF screws is required to secure
the occlusion. In the context of fracture treatment, all
fractures must be identified before starting with the first
osteosynthesis [54]. Otherwise fixation of fragments in
wrong position might happen. The number, size, and position of the single plates depend on the anatomical and
biomechanical properties of the individual fracture situation. Basically, however, the plates are positioned
alongside the horizontal and vertical pillars of the midface. For osteosynthesis, generally mini- and micro-plates
are applied that are fixed with monocortical osteosynthetic screws.
The reposition and osteosynthesis of an extended midfacial fracture generally starts with the reconstruction and
securing of the occlusion as a reliable reference for all
further steps of fracture treatment [54]. Afterwards, the
treatment starts in the superior level in reference to the
skull base and to intact bone structures, the fragments
are repositioned and fixed with mini-plates. Then the reposition continues one level more inferior (“top down”
procedure) [13], [18], [54]. By means of this procedure,
an outer frame of the midface consisting of the zygomatico-frontal transition, the zygomatic bones, and the
zygomatico-maxillary transition is established in first place
[13]. After that, after mandibulo-maxillary fixation of the
correct occlusion, the central parts of the midface (nasoethmoid complex, Le Fort I and II level) and the orbit are
treated [13]. Each wrong positioning of the bony structures in the area of the midface leads to inharmonic appearances of the facial soft tissue and thus to poor esthetical results. Additionally, massive functional disturbances such as impaired occlusion or vision may be the
consequence [54].
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2.7 Antibiotic prophylaxis of midfacial
injuries
The anti-microbial therapy in case of proven infection is
not dealt with in this paper. In the following, only statements on the prophylactic application of antibiotics in
case of facial lesions are described. Finally, it is the
question to what extent prophylaxis is useful in order to
avoid infection on the one hand and on the other hand
not to cause germ selection and avoid side effects of
antibiotic therapy [55].
The perioperative application of antibiotics corresponds
to current treatment standard for most surgical interventions in ENT and maxillofacial surgery. For treatment of
midfacial fractures, at least 2 of 3 indications are fulfilled
that are described in the AWMF guidelines on perioperative antibiotic prophylaxis [55], [56]. It is considered as
proven that antimicrobial prophylaxis applied 2 hours
before intervention leads to a lower infection rate in the
surgical field than applying the drug off this time slot [57].
In order to guarantee the effect of the antibiotic, the first
application has to be performed as early that the therapy
effective tissue level is achieved before beginning of
surgery up to the end. For interventions up to 2 hours, a
single dose is sufficient [55].
A current investigation performed by Lauder and co-authors shows that the additional application of antibiotics
outside the perioperative time span does not reduce the
rate of postoperative infections [58]. Even in cases of
extended soft tissue lesions and multiple open fractures,
a continuous prophylaxis is not appropriate. The possibly
immediate application of a cephalosporin is useful to reduce the infection rate, further medication does not
contribute advantages [59]. Those results are confirmed
by other authors. Soong et al. found no difference in oneday or 5-day application of antibiotics with 625 mg
amoxicillin and clavulanic acid for one day compared to
the 5-day therapy so that the authors recommend perioperative antibiotic therapy.
2.8 Interdisciplinary cooperation
The vast majority of lesions of the midface and neighboring structures such as the anterior skull base and orbit
content have to be cared for by more than one medical
discipline [60]. Regarding diagnostics and therapy, the
expertise of radiologists, anesthesiologists, neurosurgeons, intensive care specialists, ophthalmologists,
maxillofacial surgeons, and otolaryngologists is required
in order to achieve an optimal outcome of trauma treatment [13], [61], [62]. A consecutive procedure strictly
divided according to the different disciplines is not helpful
for patients with extended midfacial trauma and involvement of neighboring crucial structures. Unnecessary
multiple anesthesia, timely delay, and relevant impairment of the course would be the consequences. Instead,
the team responsible for the patients should consist of
all experts that are necessary for comprehensive treat-
ment. Only in this way, the individual and optimal treatments can be correctly planned and performed. The interdisciplinary coordination regards the necessary diagnostics, the surgical approaches, the provision of instruments
and additional technical devices, the sequence of fracture
therapy, and the postoperative care. For best possible
patient’s care and a smooth management, comprehensible and clearly defined procedures are necessary. They
should be appropriate and simple, in particular, there
should be no space to enlarge the own discipline in the
disadvantage of neighboring disciplines.
3 Central midface
3.1 Fractures of the nasal bone, the
nasal septum, and the naso-ethmoid
complex
3.1.1 Fractures of the nasal bone
Injuries of the external nose and nasal bone fractures
are the most frequent lesions of the midface [63], [64].
The gender ratio is 12–37% of female and 63–88% of
male patients with a median age of 27 years [65], [66].
Assault and battery is the most frequent reason of fractures in 80% of cases [66]. The fracture line mostly extends vertical to the nasal axis and is often (in 78.8%)
associated with fractures of the bony and cartilaginous
septum [67]. Septum fractures for their part, are the origin
of nasal septum hematomas that may result in severe
complications. They have to be considered as surgical
emergency therefore [65]. Based on hematoma, infections lead to septal abscesses. Rapidly, necrosis of the
cartilage may develop, a possible sequalae in such case
is a saddle nose deformity with functional impairment
[30]. In order to avoid those complications, the drainage
should by performed within 24 hours [67], [68]. A broad
spectrum antibiotic drug is applied for anti-infectious
therapy until the microbiological findings are at hand. The
most frequently found germ is Staphylococcus aureus
followed by Haemophilus influenzae, Streptococcus
pneumoniae, and β-hemolytic streptococcus of group A.
As antibiotics, penicillin and clindamycin are recommended [69]. If necrosis of the septal cartilage is already found,
an immediate reconstruction with autologous concha
cartilage should be performed in order to avoid deformity
of the external nose [65], [70].
Even in simple fracture types exact diagnosis poses a
challenge. The clinical examination is of major importance. Typical symptoms are epistaxis, soft tissue swelling, hematoma, and nasal obstruction. Especially in cases
of slowly developing nasal obstruction, septal hematoma
or septal abscess must be suspected early. Palpation
helps to reveal classical fractures. If swelling impairs
finding an abnormal mobility and crepitation, the examination has to be repeated after local decongestion [67].
Lateral radiography does not provide exact results and
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is not recommended [68], [71], [72]. Pediatric nasal injuries are assessed by the same procedure. Also in this
context it is important to rely on the exact clinical examination and not only on radiological imaging [65], [73],
[74].
The intensive, also radiological examination is undisputed
in case of severe injuries. It is more difficult to make a
decision in cases of small head injuries (defined as
Glasgow Coma Scale 14–15, unconsciousness of <5 min
and/or amnesia) that might have led to nasal bone fractures because apparently the benefit of the examination
and the radiation exposure have to the weighed out [75].
Vestergaard and co-workers analyzed the management
of all hospitals in Denmark that treat pediatric trauma.
None of the institutions performed routine radiological
examinations [75], [76], [77].
Even for injuries of the pediatric midface that seem to be
less important, septal hematoma, septal fracture, and
septal abscess must be ruled out – as children with even
mild traumatic brain injury may develop a post-concussion
syndrome or other neurological complications such as
concentration dysfunction, personality disorder, or educational problems in 10–20% of cases [78]. In pediatric
noses, the muco-perichondrium only adheres loosely to
the cartilage so it may easily be lifted by bleedings. Álvarez
observed smaller complications at the nasal septum and
the appearance of the external nose in 37.5% of septal
hematomas, severe complications in 62.5%. However,
following low-grade injuries, septal hematoma or abscess
developed in 53.2%. Only 12.5% of the examined children
had a septal fracture. All children were treated surgically,
in the group of severely injured children more than one
intervention were required. Beside esthetical deficits,
nasal obstruction is the most frequentlcomplication [79],
[80].
Nonetheless, in cases of suspected nasal bone fracture,
a lateral radiography is performed in a high number of
cases in order to avoid medico-legal problems (Table 2),
although the medical colleagues know well about the
limited diagnostic value of this examination [81]. Additional examinations are necessary in 52% of simple nasal
bone fractures to ensure diagnosis [66]. Other authors
report about a rate of 50% of false-negative findings in
the lateral radiological imaging [65]. Computed tomography is required to diagnose septal hematoma or to
exactly classify fractures [63], [67]. The task force on
osteosynthesis does not list radiological diagnostics for
simple nasal bone fractures in their recommendations
[82]. The significance of careful primary treatment becomes apparent regarding the high rate of secondarily
necessary revisions, e.g. rhino- or septo-rhinoplasty. According to the authors they vary between 9 and 50% [64].
The closed reposition from exterior is recommended only,
if the longitudinal axis is deviated exclusively, if the fracture is fresh, and the fragments do not overlap. Any other
fracture needs to be repositioned in two planes. Septal
fractures have to be repositioned openly [74]. Access and
surgical technique correspond to septoplasty. The surgical
steps are performed in the following order: external nose
in first place followed by the septum. In pediatric patients,
the objective is to preserve the connection between the
vomer and the cartilaginous septum in the axial as well
as frontal level in order not to touch the growth zones of
the inner nose [83].
Table 2: Low-grade head injuries [38]
Nasal packing and nasal protection meshes are used for
redressing and protection of the wound. They remain for
variable durations. The recommendations extend from
one to 14 days for packing and up to 3 weeks for external
nasal protection. Ointment stripes [84] are no longer
mentioned in current rhinological literature. As the soft
tissue swelling may increase again after manipulation,
special attention must be paid to the external nasal
dressing not leading to pressure damage of the skin.
3.1.2 Naso-ethmoid and naso-orbito-ethmoid
fractures
The naso-ethmoid regions structurally consists of horizontal and vertical pillars. In the cranial and horizontal regions, the frontal bone provides the shape, in the caudalhorizontal region parts of the maxillary bone and the zygomatic bone are forming and giving stability to the orbit.
Medial is the insertion of the canthal tendon at the bone
is of central importance. It provides support to the eyeball,
the eyelids, and the orbicularis oculi muscle and is the
border to the lacrimal sac. The bony base is the “central
fragment” and represents a particular challenge for reconstruction [7], [85], [86]. The lateral pillar consists of
the zygomatic, frontal, and maxillary bones. From there,
surgeons usually start to reconstruct the midface for
fracture reposition. Based on this reference, the intervention proceeds in medial direction.
Frontal trauma of heavy impact (3.6–7.1 kN) [87], [88]
breaks the nasal bones and the frontal processes of the
maxilla as well as the ethmoid cells. In contrast to frequent nasal bone fractures, naso-ethmoid fractures occur
rarely with 5–15% of facial fractures. They belong to the
most complex cranio-maxillofacial fractures and every
insufficient treatment may lead to severe esthetical and
functional impairment. They rarely occur as isolated
fractures – they are mostly part of pan-facial fractures
[85].
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Table 3: Classification according to Markowitz [91]
The naso-ethmoid complex is shifted in posterior direction
and the nose loses its projection. Because of the shear
forces to the orbit, simultaneous damage of the orbital
cavity is likely. If the canthal ligaments are detached from
their periostal base or severed, there is at least a cosmetically disfiguring result of the orbital septum (telecanthus)
or even a functional deficit of the eyelid system [89] which
may become obvious as impaired eyelid closure or disturbed lacrimation. The small lacrimal ducts can be injured by direct trauma, the big lacrimal ducts are mostly
injured by indirect trauma [90].
The classification established by Converse classifies
trauma according to the direction of impact. Grade I
means that the nasal bones are hit by an impact from
the frontal inferior side and move in dorsal and lateral
direction cutting the canthal ligaments. The fragments
are pressed into the interorbital space. In case of grade
II, the impact comes from a frontal direction. The canthal
ligaments still adhere to one fragment and are drawn by
muscular traction of the orbicularis oculi muscle in a lateral direction. The widely accepted classification according to Markowitz is based on the condition of canthal
tendon mainly [88]. The difference is still made between
uni- or bilateral fracture and regarding an extension of
the trauma into other regions (Table 3) [74], [91].
As for other types of fractures, all classification systems
have particular advantages, however, they often do not
exactly meet the individual fracture mechanism. In cases
of naso-ethmoid and naso-maxillary fractures the possibly
most exact description of the fracture course based on
CT diagnostics was established. For example, naso-maxillary fractures concern the same anatomical region as
the traumas classified according to Markowitz, but the
canthal ligament is intact [92].
The symptoms of naso-ethmoid fractures include significant swelling of the soft tissue envelope, saddle nose
deformity, epiphora, olfaction disorder, epistaxis, monocular or binocular hematoma, hyposphagma, CSF leak in
case the cribriform plate is affected, diplopia, and nasal
obstruction. Infection in the further course may develop
as well as atypical facial pain [18]. The swelling makes
diagnosis based on clinical criteria difficult so that injuries
may not be diagnosed to their full extent.
Clinical examination reveals the abnormal mobility of the
bone fragments, the focus hereby is placed on the central
fragment. Rounded canthi (“cow’s eye”) are a first sign
of a dislocated fracture. The integrity of the canthal ligament may be tested by pulling the eyelid in a temporal
direction and checking wether or not the central fragment
is mobile [93]. If the intercanthal distance exceeds
35 mm, rupture or dislocation of the canthal ligament
must be taken into account. For the exact presentation
of the fracture courses, computed tomography is essential. With slice thickness of 1 to 2 mm, the reconstructions
of the 3-dimensional conditions allow evaluation and
planning of surgery [85], [89]. Only if fragments are not
mobile on palpation and no dislocation is found, conservative therapy may be performed. All other fracture types
require open reposition and fixation. The choice of access
depends on the extent of the trauma. Up to 4 incisions
may be needed to achieve a satisfactory overview: the
coronal incision, the sulcular vestibular incision, the approach to the orbital floor, and if needed a small access
medial to the nasal dorsum [94]. This medial incision at
the radix allows a easier reposition of the central fragment
for wire osteosynthesis than the coronal incision [95].
The wire osteosynthesis is preferred in comparison to
plate osteosynthesis because the central fragment is
small and mobile [96]. Engelstad presented a method of
reconstruction that provides several advantages in case
of unilateral trauma. The canthal ligament is taken with
a wire or a non-absorbable suture and fixed to the medial
orbital rim by an osteosynthesis plate [86], [97]. If the
tendon of the canthal ligament is completely detached
from the bone or if the bone fragment is too small to be
taken by wire osteosynthesis, a suitable bone fragment
is chosen that can be brought into contact with the supraand infraorbital bone bridge [85]. Prior to reconstruction
of the naso-ethmoid complex, the frame consisting of the
frontal and maxillary bones is reconstructed [88], [89].
The treatment with external redressing of the fragments
that was formerly applied, was replaced by internal fixation [52], [93], [98].
In cases of less extended fractures in the central midface,
individually designed local approaches may be sufficient.
These options are discussed when already a traumatically
caused access is present. In order to treat canthal ligaments that are detached from the bone or extended
fractures with dislocation in a functionally and esthetically
satisfying way, mostly an approach via coronal incision
is recommended [2], [93], [98]. The soft tissue envelope
especially in the area of the supra-alar crease is plugged
in its original position by pressure bandage [85].
The drainage pathway of the frontal sinus can be impaired
by dorsal dislocation of cranial fragments. Disturbed
drainage pathways are the sequel which is preferably
treated by median drainage of the frontal sinus [74]. The
transposition in a posterior direction of the nasal bones
is associated with a dislocation of the quadrangular
lamina and the bony-cartilaginous connection at the
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rhinion [99]. If a comminuted fracture is found of which
the fragments cannot be assembled in a stable form, the
reconstruction with bone transplantation from the skull
is a safe measure to avoid soft part shrinking of the nose.
This would then be secondary and only difficult to treat
[94]. Beside cranial bone, also transplantations from the
rib are appropriate. In the field of rhinoplasty, much experience could be gained from this procedure, but rib
transplantations are more likely to deform [100] and
cannot be screwed as easy at the nasion as “calvarian
cantilever grafts” taken from the calvaria [88].
3.2 Injuries of the frontal sinus
3.2.1 Epidemiology, pathogenesis,
classification
Injuries of the frontal sinus contribute to maxillofacial
trauma, with 5–15% [101], [102]. They occur only after
impact of significant energy (1–2.17 kJ) or a force of 3.6
to 9.0 kN [103], [104], [105], [106] because the bone
of the anterior wall represents a strong horizontal barrier.
(The values given in the literature can only be transferred
to the SI system in a limited way. The units in the primary
literature are sometimes chosen unconventionally.) Its
thickness is up to 12 mm, the posterior wall is relevantly
thinner with 1.9 to 4.8 mm [107]. The most frequent
origin are traffic accidents (31.7%), sports accidents
(28.0%), work-related accidents (20.1%) and violence
(3.7%). Predominantly young men aged between 20 and
30 are affected years [62], [108], [109], [110], [111].
Pollock found in an investigation of 154 patients in Kentucky who had an accident that the origin was a traffic
accident in 50%, 81% were male patients, the median
age was 34 years [112]. 66% of the patients had additional craniofacial fractures, 35% had accompanying orbital fractures [113]. External injuries are observed in
50%, in 25% of the cases an impression is visible in the
acute stage. Concomitant symptoms are epistaxis, impaired vision, edema, paresthesia, and pain on a regular
basis [103]. Because of its stability, the anterior wall of
the frontal sinus resists better than every other
craniofacial bone to external forces [62], [105], [114]. In
one third of cases it is the only bone concerned. In only
5–11%, the posterior wall is solely fractured [105]. In
38.4–80% of cases, the posterior wall and the frontal
recess are affected as well, in 70.7% the drainage pathway is concerned whereas in 67% obstruction is observed
and in 16–30% additional CSF leakage occurs [48], [101],
[110], [112], [115], [116]. Trauma to the nasofrontal
duct was found in 29.2% of cases by Dalla Torre et al.
[109]. If complications occur, they concern the frontal
sinus drainage pathway in 95% [116]. The ratio of fractures through the lateral floor of the frontal sinus compared to fractures through the medial floor of the frontal
sinus is 3:1. Pollock recommends high resolution parasagittal CT scans for diagnosis of the drainage pathway
and the floor of the frontal sinus [112].
A series of classifications was suggested, however, none
of them could really be established [19], [117], [118],
[119]. In contrast to merely anatomically oriented classifications, systems are preferred that contain information
about the therapeutic procedure [119]. Fractures of the
floor of the frontal sinus and the fronto-ethmoid transition
are radiological hints to involvement of the drainage
pathways.
3.2.2 Diagnostics
The clinical diagnosis of frontal sinus fractures remains
incomplete and is additionally impaired by initial swelling.
Among the symptoms, the following findings are observed:
epistaxis, anesthesia and dysesthesia in the field of the
first branch of the trigeminal nerve, rhino-liquorrhea,
subconjunctival ecchymosis, orbital emphysema, soft
part defects, and bone dislocations. In order to be able
to decide about an appropriate therapeutic regime, the
anatomical aspects must be examined based on CT
diagnostics [105], [111], [113], [120]. The standard of
imaging diagnostics is computed tomography. Whenever
possible in high resolution and submillimeter technique
to enable multiplanar reconstruction [103]. The
rhinosurgeon is used to evaluating CT scans of the
paranasal sinuses and would apply the same technique
as for inflammatory diseases [121]. Patients with multiple
injuries undergo spiral CT examination that is standardized for trauma patients [113], [122]. If sections of less
than 2 mm are acquired and 3 planes are provided, a
correct statement about the injury of the drainage pathway can be made in 96% of the examined cases [123].
The integrity of the frontal recess, the anterior wall of the
frontal sinus, the posterior wall, and the dura are in the
focus of interest. The diagnostics of suspected or existing
dura fistula with CSF flow is described in one of the following chapters on frontobasal injuries.
3.2.3 Indications of surgery and
contraindications
The objectives of surgical treatment are, according to
their significance, the therapy of dura fistulas and thus
the separation of the neurocranium from the nose and
the facial skull. It is important to avoid early and late
complications, especially complications of the central
nervous system. The outline of the forehead should be
reconstructed simultaneously with taking care of the
physiological function [106], [111].
The recommendations were adapted to modern criteria
of frontal sinus surgery. The technical conditions have
changed fundamentally due to advances in endoscopic
sinus surgery [124]. Since 1987, obliteration as primary
intervention for frontal sinus fractures has been questioned [117], [125].
In every case, the wound has to be cleaned, foreign
bodies must be removed and cerebral lesions have to be
treated [110]. Obliteration and cranialization of the
frontal sinus are still a frequently performed therapy of
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fractures of the medial floor of the frontal sinus and of
complex fractures that also concern the posterior wall
[111].
In order to avoid mucocele formation, surgical interventions need to be accurately planned and executed in case
of traumatized naso-frontal transition [62], [109].
Kalavrezos, B. Strong, and Koento recommend obliteration of the sinus cavity in case of fracture and obstruction
of the frontal recess, whereas Smith et al. and Rice et al.
as well as other groups consider wait-and-see strategy
[102], [106], [111], [125], [126], [127], [128]. Xie et al.
evaluated 4,000 patients’ charts with frontal bone and
cranial fractures over a time period of 30 years. As described by Wilson and co-workers, reconstruction was the
better alternative compared to obliteration and cranialization [129], [130]. The probability that the natural
drainage is reestablished or can be reestablished by endoscopic surgery in case of complication is high. Precondition for such a procedure is a sufficient compliance of
the patients who would present for CT diagnostics immediately in case of complaints in the area of the frontal sinuses. Patients have to be informed about sinogenic orbital complications and sinogenic meningitis or cerebral
abscess. The minority of mucoceles and pyoceles of the
frontal sinus, however, are due to trauma [19].
Obliteration would then be reserved to cases where endoscopic procedures fail or the primary damage is so
extensive that anatomically correct reconstruction seems
to be impossible [110], [127]. Further complications are
chronic sinusitis, meningitis, and cerebral abscesses
[101].
Fractures of the anterior wall of the frontal sinus are
treated only in case a cosmetic deficit must be expected
[111]. As of a dislocation of 4 mm, Kim et al. consider
the situation as being treatment-worthy [50], [131].
Strong et al. recommend therapy already at a dislocation
of 2–6 mm in order to avoid cosmetic deficits later on.
Since the morbidity of the treatment via coronal incision
or pretrichial approach [106], [126] may exceed the immediate trauma sequel, an endoscopic approach should
be considered in these patients. Also the trauma access
must be checked because in half of the cases a soft tissue injury is found [103]. There is no indication for obliteration in those injuries [112].
Generally, the external force leads to plastic deformation
of the bone. It may be impossible to arrange the fragments in their anatomically correct position [23]. The
edges of the fragments are grinded in order to facilitate
reposition. For osteosynthesis, titanium plates of different
thicknesses [48].
Endoscopic procedures are applied to reduce the considerable rate of complications that are associated with the
coronal incision. Especially scars, paresthesia, and alopecia must be taken into account. The approach corresponds to the one of endoscopic brow-lift. Incisions of
2–5 cm in the area of the hairy scalp, 3 cm way off the
hairline, are performed to insert the endoscope and the
instrument for dissection [101], [102]. The fragments
are mobilized via an additional percutaneous access
(stitch incision), retrieved via the endoscopic access, and
grinded. At the table they are fixed on a microplate before
being repositioned. The screws at the skull are tightened
percutaneously [108].
It is technically simpler to perform secondary reconstruction of the front with endoscopically inserted transplants
made of polyethylene or titanium to bridge the defect. A
self-tapping screw fixes the implantation at the bone.
Egemen describes a technique where the visualization
occurs via the endoscopic brow-lift and fragments are
repositioned via a stitch incision transcutaneously. A
screw facilitates the manipulation [115]. Reposition of
the fracture in this way can be technically challenging,
especially when the fragments are found laterally [103]
so that the secondary improvement of the outline is recommended as alternative [127]. Dislocated fragments
of the anterior wall can also be treated via a miniaturized
access at the eyebrow. The cosmetic outcome is described as satisfactory [132], [133]. Blood loss, long
duration of hospitalization, and neurological deficits as
they are observed after coronal incisions can be avoided
[23], [134].
Molendijk describes another minimally invasive procedure
for the treatment of fractures of the anterior wall with
2–3 bigger fragments: osteosynthetic screws with a diameter of 2 mm are screwed transcutaneously into the
fracture fragments and manipulation at the screw heads
leads to reposition [103].
Extensive reconstructions are possible via a coronal incision with exposition of the whole forehead. The fragments are put into a position that corresponds to the
contour of the contralateral side. As frontal force leads
to compression of the bony tissue, the fragments can
hardly be repositioned and fixed without prior processing
for adaptation. Plastic measures at the fragment edges
facilitate reposition. Defects that have to be covered in
order not to risk deformed frontal contours by sinking
soft tissue can be bridged with titanium meshe. Hydroxylapatite is not recommended because of the risk of
infection [101].
Fractures of the posterior wall of the sinus are often associated with dural lesions and CSF leak and require
special attention. The probability of dural lesions increases with the dislocation of the fragments. If the anterior and posterior wall of the frontal sinus are fractured,
in 86.7% also endocranial lesions must be suspected
according to Molendijk et al. [103]. In 25% of the patients
with frontal sinus fracture, there is a dislocation of more
than 5 mm. Hereby the probability of CSF leak is clearly
higher than in cases of minimal dislocation [109]. Day
and co-workers consider therapy through the cavity as
being insufficient and recommend neurosurgical craniotomy [48], [135]. As described in the chapter on frontobasal lesions, also in the context of ethmoid and frontal
sinus fractures the necessity should be discussed to treat
concomitant CSF-leakage. Bradley Storng and several
other authors recommend conservative therapy of CSF
leak for 7–14 days and observe the situation. In 50% of
the cases, they found spontaneous closure which they
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considered as sufficient. Pollock achieved closure of the
leak in 38% of his patients by a wait and watch strategy,
the other 62% were treated via a coronal incision. Complications of cranialization, which is performed in 35%,
amount to 6% [112].
Only in cases of persisting leakage, he performs duraplasty together with obliteration of the sinus. If the dislocation is larger than the wall thickness, the sinus is also
obliterated when no dural lesion is present. If the defect
expands to more than 25–30% of the posterior wall,
cranialization should be discussed according to these
authors. Blocking of the drainage pathway that is required
in these cases. Various materials are discussed while
there is no superiority of one of these. All authors agree
to the recommendation to completely remove the mucosa
from the cavity and to invert the mucosa of the drainage
pathway and to push it in nasal direction. As material for
the barrier in cranial direction, bone, bone chips with
gelatin, a pedicled periostal flap, or muscle plugs are
suggested [112], [136], [137].
The long tradition of aggressive surgery of frontal sinus
fractures is based on procedures that were established
in the first part of the last century. The main reason to
readily obliterate the frontal sinus was the fear of complications such as fulminant sinusitis, development of
celes and cerebral abscesses originating from the sinusoidal mucosa [112]. In case of fractures of the posterior
wall, it was suspected that the epithelium grows into the
endocranium and that mucoceles may develop there.
However, it turned out that that mucocele formation did
not increase due to damaged drainage pathways [138].
The development in the field of endoscopic sinus surgery
questioned the indication of primary obliteration and
cranialization. The success of secondary surgery is an
important reason why surgeons are more reluctant to
fundamentally change the anatomy of the frontal sinuses
today [106], [113], [124], [139], [140].
Many authors take their decisions based on the type of
lesion of the frontal sinus drainage. In case of radiological
evidence of impaired drainage pathway, obliteration or
cranialization may be considered rather than preserving
the ventilated sinus [116], [123], [126], [141]. If 2 or 3
of the following criteria are fulfilled in CT diagnostics, the
probability amounts to 81% that the drainage pathway
of the frontal sinus is damaged: 1. Fracture of the floor
of the frontal sinus, 2. Fracture of the medial part of the
anterior wall of the frontal sinus, and 3. Obstruction of
the drainage pathway. In those cases, Yakirevitch argues
for obliteration and cranialization [142], [143], [144].
Rodriguez performed follow-up examinations in 857 patients where he had found a complication rate of 9% for
obliterated frontal sinuses and of 10% for cranialized
frontal sinuses [145], [146] (Figure 4).
The access via an incision medial to the medial canthus
with different lengths in cranial and caudal direction is a
standard approach to the frontal sinus since the beginning of the last century [147], [148]. Because of the poor
view on lateral direction and the risk of scars obstructing
the frontal sinus drainage, however, it plays a minor role
in the treatment of frontal sinus fractures nowadays.
Strong recommends trephination in order to identify
hematomas, fractures, and dura fistulas [101], [126].
One might return that hematomas are not relevant, fractures can be assessed by CT scans with sufficient safety,
and CSF leaks cannot be safely excluded.
The coronal incision with partial removing of the anterior
wall represents the procedure providing the best overview
and highest safety. However, also in this context the
negative consequences of scars, risk of infection, alopecia, and longer wound healing must be mentioned in
comparison of endoscopic procedures. Fractures and
dural lesions near the frontal sinus outlet are covered
endonasally according to the standard procedures of
functional endoscopic sinus surgery. Since it is not possible to reach fractures in cases of small frontal sinus
ostium (<6 mm) [149], lateral of the pupillary line and in
the cranial parts of a pneumatized frontal sinus, miniaturized external approaches are described that allow the
use of endoscopes and the according instruments
(Figure 5).
Small defects no bigger than 5 mm areas within reach
can be treated endoscopically. Many authors consider
cranialization as not being necessary if the CSF leak is
just due to the fracture of the posterior wall of the frontal
sinus. The defect is closed by bath plug technique for
example. Permanent closure rates of 86–100% are
achieved with minimal morbidity.
The data on the number of cranialized frontal sinuses
vary according to the reports. Donald considers it a necessary procedure in 13.7%, Pollock performs it in 35% of
his followed-up patients [102], [146], [150]. It would be
interesting to know if rhinologists, maxillofacial surgeons,
and plastic surgeons prefer different procedures that are
due to their special training [112], [116], [127].
For obliteration, different materials are recommended.
Besides autologous bone [151], [152], [153], e.g. as
calvarian bone dust, fat of different origin, temporalis
muscle [154], [155] also alloplastic material such as hygroxylapatite [156] and demineralized, attenuated human
bone are used [145], [152]. Strong recommends fat taken
from the abdomen [101], [126]. Most reports are published for this material and it is the material with the
longest tradition. Weber and co-authors report a case
series of 59 patients who were followed-up over a period
of 12 years. They found mucoceles in 10%. In more than
50% of cases the fat transplant decreased to 20% of its
initial amount. The median half-life of the implanted fat
was 15.4 months [157], [158]. The best results are reported for autologous bone [159], [158]. Inflammatory
foci may hide in transplanted fatty tissue [144], [145].
The complication rate for sclerosed frontal sinuses is
stated with 10.4% by Rodriguez. The percentage of obliterated ones amounts to 9%, the percentage of cranialized
frontal sinuses amounts to 10%. In his case series, fat
and osteoneogenesis as principles of obliteration had
the highest complication rate with 22% of the ones obliterated with fat and 42.9% of the frontal sinuses that un-
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Figure 4: Frontal sinus fracture. From left to right, the arrows mark: the central fragment with base of the canthal ligament and
the trochlea, involvement of the drainage, posterior wall of the frontal sinus.
Figure 5: Lateral transorbital osteotomy of the frontal sinus
derwent osteoneogenesis [116], [144]. Complications
following frontal sinus injuries occur in 15.2% of cases
after 12 months. However, there is a life-long risk of
complications if a frontal sinus had to be reconstructed
[106], [128], [155]. The highest rate is observed with
simultaneous intracranial lesion [109]. IN 11% of the
cases, a post-traumatic pain syndrome must be expected
[110].
Local osteomyelitis and cerebral abscesses can be a
consequence of a lesion of the frontal sinus [19].
Since obliterated frontal sinuses tend to surgery-worthy
complications in 5–30% of the cases independent of the
primary surgical indication [116], [144], [152], [160],
[161], [162], special strategies of endoscopic revision
surgery were developed [18], [163], [152]. The new
indications for surgery were mainly based on mucoceles,
followed by complications due to bone wax, connective
tissue, and polypoid mucosa [152], [160]. In this context,
the paper by Weber in this volume is referred to.
In the more recent literature, the trend goes to therapy
preserving the frontal sinuses [110], [164], [165], [166],
[167]. Clinical and radiological controls in narrow intervals
are recommended in order to early detect the development of complications and to react accordingly. Even if
the complication rate after a very long time is still to be
investigated, especially for minimally destroyed drainage
the results of conservative therapy seem to be comparable to more aggressive procedures with obliteration
and cranialization [113], [125], [168], [169].
3.2.4 Summary
Until the contrary is proven, a dural lesion should be expected in all frontal sinus injuries with fracture of the
posterior wall.
The injury of the drainage pathway is considered as
central criterion for the indication of aggressive surgery,
if required with obstruction of the sinus.
Even if the rapid development of the sinus surgery
provides possibilities of functional preservation of the
frontal sinus after trauma, the traditional procedures of
obliteration and cranialization are still widespread
procedures of primary therapy. Especially in the rhinological literature there is a clear tendency to perform therapy
with preservation of the frontal sinus [170]. In patients
with reliable compliance, it is recommended to react on
complications when they occur [127], [128]. The cranialization of the sinus is reserved to neurosurgical intervention.
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3.3 Ethmoid and sphenoid sinus
fractures, fronto-basal injuries
3.3.1 Epidemiology, pathogenesis,
classification
Isolated injuries of the ethmoid sinus are rare [171].
Fractures of the ethmoid cells without concomitant injuries are so rare that data about their incidence and
pathogenesis are not found in the literature. If isolated
fractures of the ethmoid cells are diagnosed, wait-andsee strategy is justified. Surgical intervention is limited
to the treatment of inflammatory complications and
marsupialization or resection of mucoceles in the postoperative course [172]. The situation is different if the
fronto-ethmoid or maxilla-ethmoid complex is involved.
In this context, the preventive surgery may be indicated
in individual cases in order to secure the drainage of the
frontal and maxillary sinuses [173].
Ethmoid bone fractures typically occur together with extended fractures of the facial skull and are treated in
combination with the orbit, frontal sinus, sphenoid sinus,
and especially fronto-basal fractures with dural lesion.
Ethmoid bone fractures with involvement of the orbit are
usually medial blow-out fractures. When the orbital lamina
is fractured, most often also a fracture of the orbital floor
is observed. A clinical hint is given when the ab- and adduction of the affected eye is impaired. Often, however,
there are no clinical symptoms in the acute phase [30].
An orbital emphysema may develop via the ethmoid sinus,
less probably the maxillary sinus. If it appears, van Issum
et al. recommend to wait for 10 days before performing
surgery so that the ophthalmological diagnostics can be
performed in a mostly decongested eye [172].
The most frequent lesions in the area of the ethmoid sinus leading to direct clinical complications are structural
disturbances at the anterior skull base. Gjuric and coworkers found in patients of the University Hospital of
Erlangen, Germany, the most frequent injuries of the
ethmoid roof after trauma, followed by iatrogenic injuries
[174]. Other authors confirm this distribution even more
clearly (80–90% of traumatic lesions) [175].
In the following, the ethmoid sinus lesions with involvement of the anterior skull base are discussed. The special
focus is placed on lesions with CSF leak. This is defined
as an open connection between the subarachnoidal space
and the mucosa-bearing parts of the nose and paranasal
sinuses [175] (Figure 6).
Injuries of the skull base occur in 43% in the context of
complex midfacial fractures [20], [176], in the context of
centro-lateral fractures in 25%, of lateral midfacial fractures in 13% [18], and in the context of cranio-cerebral
lesions in 21% of cases [177]. Le Fort I fractures are associated with skull base fractures in 1%, Le Fort II fractures in 37%, and Le Fort III fractures in 10% of the cases
[178]. One third of the patients with fronto-basal fracture
also suffer from dura fistula. The ratio of male to female
is 3:1 [179].
Figure 6: Frequent locations of fronto-basal fractures with CSF
leak (green) and medial orbital fractures (blue)
Fractures of the anterior skull base primarily concern the
cribriform plate and the lateral lamella of the cribriform
plate– the thinnest parts of the skull base [18], [31],
[180] – and the ethmoid roof. A weak point in the static
is the entrance of the ethmoid arteries. The orbits and
the adjacent paranasal sinuses are affected more rarely
[181].
Fronto-basal dura fistulas develop as sequel of craniocerebral injuries with fractures through the anterior skull
base mainly in the area of the cribriform plate and the
lateral lamina [18]. Here as well, the course of the ethmoid arteries are areas of minor resistance. Since the
dura is very thin in the area of the anterior skull base and
firmly attached to the bone, CSF fistulas develop easily
in this area [182]. There is risk of ascending infections,
of pneumocephalus as well as brain tissue herniation
into the nasal cavity or the paranasal sinus system.
3.3.2 Diagnostics and surgical indications
3.3.2.1 Clinic
Leakage of cerebrospinal fluid is evidence for frontobasal injury. The side where the liquor exits, however,
does indicate where the actually leak is [183]. Pre-clinical
tests are not safe and of low significance. Valsalva or
Queckenstedt manoeuvers could increase the CSF flow
by the higher intracranial pressure. Valsalva manoeuver
should be avoided by all means though as there is risk
of pneu-encephalon [184].
Even for experienced rhinosurgeons, the diagnosis of
dura fistulas remain challenging. Independent from the
etiology, the bacterial meningitis represents the main risk
[179]. The endonasal therapy of a CSF fistula has to be
postponed until a nearly normal intracranial pressure is
found. In order to avoid pneumocephalus, the patient
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must not blow his nose and nasal cPAP therapy needs to
be discontinued. Fatal complications are described in
this context. This situation must be discussed with the
anesthesiologist with regard to introduction of anesthesia.
Increasing headache or neurological decline following an
accident iatrogenic dural lesion may indicate epidural air
with valve mechanism. Tension pneumocephalus is an
acute life-threatening situation. The suspicion should lead
to cranial CT scan. Special attention must be paid to the
Mount Fuji sign. The subdural air dilates the poles of the
frontal brain and widens the interhemispherical gap. The
horizontal CT image reminds of the silhouette of Mount
Fuji [185] (Figure 7).
Figure 7: Pneu-encephalon with Mount Fuji sign in the axial CT
scan
3.3.2.2 Radiological procedures
The standard diagnostics in cases of craniocerebral injuries is computed tomography. For examinations in the
context of fronto-basal fractures, the coronal CT scan in
sections of 1–2 mm is particularly appropriate. Classical
radiological procedures do not play a major role [30],
[122], [174]. In the acute treatment of patients, the ENT
specialist and the maxillofacial surgeon take care that
besides the presentation of the endocranium also a highresolution CT scan of the midface, the skull base, and
the orbit is performed to assess neurosurgical aspects.
From those original data, all necessary planes may be
reconstructed [15], [18], [31], [122], [179], [186], [187].
During routine diagnostics, often fractures of the anterior
skull base are overlooked. Perheentupa et al. could reveal
overlooked fractures in 23% of the cases in a retrospective analysis of 27 patients with frontobasal injuries [188].
So they recommend a strict algorithm for evaluation that
should allow primarily identifying 93% of the fractures.
The posterior wall of the frontal sinus, the lateral and
dorsal wall of the sphenoid sinus are best assessed in
the axial section. Fractures of the cribriform lamella, the
lateral lamina of the cribriform lamella, and the foveolae
of the frontal bone as well as the sphenoid planum are
most safely diagnosed in the coronal section. Meco also
developed a diagnostic algorithm. For traumatic lesions
at the anterior skull base, the authors recommend performing a high-resolution CT and the β-trace or β-transferrin test. If the blood testing is negative to cerebrospinal
fluid but the radiological diagnostics further support the
suspicion of dural leak, the fluorescein test is performed.
In a positive case, the proof of treatment-worthy lesion
is given, in the negative case, the degree of fracture dislocation gives a hint on the probability of dural lesion.
With a dislocation of 3 mm and more, it is expected to
be high. In 8 of 12 patients, the authors found a dura
fistula intraoperatively. If a pneu-encephalon is found, it
is confirmed [179].
Radiological procedures such as cisternography are reserved to exceptional cases and play a subordinate role.
Cisternography with contrast agent or radioactive markers
is performed as CT examination and allows the presentation of the leakage pathway. It is an option when persisting CSF flow is observed or if the flow can be provoked
by Valsalva manoeuver. The examination is associated
with the risk of a complication and it is available only in
very few centers. For MR cisternography, contrast agent
is not necessary. In a strictly T2 weighted examination,
an attempt is made to identify the CSF leak [189]. In
some cases, rapid spin echo sequences with fat suppression are applied [190]. Both procedures are characterized
by weak local resolution [187]. Cisternography with radioisotopes (indium111) only have historical significance
[122], [191].
3.3.2.3 Confirmed CSF leak and staining
Even though test on glucose is still mentioned in the literature, especially to preclinically prove a CSF leak, its
significance is not sufficient to provide safe diagnosis.
The glucose concentration in CSF is higher than in nasal
secretion so concentrations of 40 mg/dl in the secretion
raises suspicion of underlying CSF leak [18], [122].
Eljamel gives the risk of meningitis with 0.62% in the first
24 hours, 9.12% within the first week, 18.82% up to the
end of the second week (cumulative values), and 7.2%
per week within the first month [192].
The indication for surgical treatment is simple when the
CSF flow is clinically apparent or if specific CSF protein
is found [179]. (β trace test: The nephelometrically detectable β-trace protein from the prostaglandin metabolism is about 30 times higher in the CSF than in serum.
With levels of 6 mg/l and more, CSF is suspected.) In
those cases, a fistula has to be searched and a closure
in one of the described techniques is pursued. If the proof
cannot be made, either because no nasal secretion can
be collected or if the proof was not successful, a dura
fistula cannot be excluded [122]. However, even for experienced rhinosurgeons it is not always easy to intraoperatively identify the CSF leak. The situation is particularly
difficult when the CT diagnostics reveal endocranial air,
but no CSF flow is apparent [20]. The traumatic edema
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Table 4: Fluorescein application for detection of CSF leaks
Figure 8: Rhinobasal fractures. Coronal CT scan, CSF leak (fluorescein stain), cartilaginous underlay, mucosal transplantation.
of the mucosa can block a leak so that CSF flow may still
occur after the first stage of wound healing [74], [179].
Air bubbles in the endocranial epidural space are a relative indication. If no dislocated fracture is found and the
control of the initially negative CSF finding after decongestion of the nasal mucosa remains negative, a surgical
exploration is not performed. Intracerebral air, however,
confirms a defect of the dura. To find this leak, may be
difficult if computed tomography does not reveal a fracture. In those cases, a wait-and-see strategy is justified.
If no clinical nor blood testing on CSF is revealed after
two weeks, the intrathecal application of Elliot’s reagent
of buffered fluorescein solution is an efficient method to
stain CSF [61]. Often it is possible in this way to not only
confirm a CSF leakage but also the location of the defect.
The procedure was introduced by Kirchner et al. in 1960
[193]. Fluorescein is applied without preservatives. The
substance is prepaired prior to each application and
buffered in the correct pH area. In literature, there are
different data on the concentration, total dose, and the
best time of application [179], [194], [195], [196]
(Table 4).
As there is no approval for this substance as drug for intrathecal application neither in Germany nor in the US,
informed consent has to acquired very carefully. The rules
of medical curative trials are applicable. The complications mentioned in literature are headaches, radicular
symptoms, temporary pulmonary edema, cerebral insult,
hemiplegia, and death. In an investigation of possible
complications, Keerl et al. revealed a complication rate
in 420 applications from 1969–1997 of 0.1%. Meco et
al. performed 900 fluorescein tests with 0.5 ml of a 5%
sodium fluorescein solution and observed no complications [179]. The most severe complications are most
probably due to incorrect application and do not limit the
use of the procedure [196]. Endoscopic examination of
the nose is repeated in intervals of 2 hours at least twice
after maximal decongestion. In order to be sure not to
misdiagnose pseudo-rhino-liquorrhea, the tympanic
membranes are examined also. To the author’s opinion,
the sometimes recommended application of filters [187],
[196] is not necessary because the staining is obvious.
Visible fluorescein at the skull base helps the surgeon to
identify the CSF leak in difficult cases. Furthermore it
helps to prove wether or not the defect closure is “watertight” [187]. However, a considerable rate (26.2%) false
negative results must be expected [194]. Wether this
rate is due to too short-term application of the dye prior
to surgery, is difficult to assess. With regard to the dynamics of liquor circulation, fluorescin application 24 hours
prior to surgery helps to improve results by almost [196]
100% (Figure 8).
3.3.3 Therapy
After craniocerebral trauma with dura fissure, CSF flow
usually occurs within 48 hours [197]. Within the first
3 months after injury, 95% of CSF leaks become evident.
The clinical diagnosis of CSF leak may be impossible since
patients with severe craniocerebral trauma mostly arrive
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at the hospital intubated, nose and midface are relevantly
swollen, and coagulated blood additionally obstructs the
nose [18].
70–85% of the defects close spontaneously or after decreasing the CSF pressure by external lumbar liquor
drainage, elevation of the upper part of the patient’s body,
and other measures to avoid increased CSF pressure
[184], [192], [198], [199]. Several authors accept conservative therapy if it is successful within a maximum of
2 weeks. For fractures with proven CSF leak of the skull
base in the frontal sinus, Torre and co-workers consider
wait-and-see strategy as being justified. The short followup time of 12 months is considered as a limiting factor
of the study [109]. The clinical and laboratory confirmation of stopped CSF flow is understood as therapeutic
success [112], [171], [175]. Since the leak is only closed
by a connective tissue layer that is not very resistible or
by mucosa and since the dura does not regenerate, ascending infections may cause meningitis in the long-term
in 30–40%. 10% of the patients suffering from meningitis
die of the sequelae [200]. A secure data situation about
the long-term courses of CSF leak does not exist. The
difficulty is obvious considering the latency of 2 decades
when meningitis can still be associated with trauma [198].
3.3.3.1 Closure of rhinobasal defects
Defects of the anterior cranial fossa with CSF leak have
to be considered as possibly life-threatening because of
the risk of meningitis. In order to meet this risk, surgical
closure is recommended. There is wide agreement that
endonasal endoscopic treatment of the lesion is suitable
for reduction of the trauma-related rate of meningitis
[174], [186], [201], [202], [203], [204], [205]. In this
context, the hygienic aspects during surgery at the skull
base should correspond to those of neurosurgical interventions. The perioperative application of antibiotics is
recommended as explained above (see chapter 2.7)
[187]. The endonasal access is considered as safe and
therapy of choice. It is equivalent or even superior to
other approaches with regard to permanent CSF tightness
[205]. A permanent closure is achieved in more than 90%
of the cases [171], [186], [194]. For the open access,
the closure rates amount to 70–80% [4], [202]. Nonetheless, the open approaches with endocranial, sometimes
intradural defect coverage are indicated if comminuted
fractures, multiple defects, or severe deformities of the
base are found [187].
There are three different methods of defect closure: the
sandwich technique, the bath plug technique, and the
technique of tissue reinforcement.
Successful defect closures were described for a multitude
of applied transplants. Location and size of the defect
determine the choice of the method as well as the individual experience of the surgeon [206]. Free mucosal
grafts are harvested from the inferior [14], [130] or
middle turbinate, the lateral nasal wall, or the nasal
septum. The mucosa of the middle turbinate is thin and
delicate, it is only suitable for very small and non-dislo-
cated fractures. Mucosa of the inferior turbinate is sufficiently resistible and can be gained in the usually needed
quantity [174]. In this context, care must be taken that
it can only be put into a planar surface by filleting. Free
transplantations form a firm connection with the underlying bone one week after surgery and are replaced by
connective tissue after about 3 weeks. Since they shrink,
their size is is to be calculated larger as really needed at
the time of surgery [174].
Collagen tissue coated with fibrin glue allows tight closure
without causing a defect at the turbinates, the lateral
nasal wall, or the septum which would be needed to gain
a free mucosal graft. Other materials are applied with the
same success rates [46], [186], [207]. Small defects up
to 1 cm in diameter can be closed effectively with onlay
technique. The mucosa must be removed completely
from the surface in an area of 5 mm around the defect,
in order to create a favorable site for the graft [149],
[208]. Autologous and alloplastic materials are at disposition.
Middle-sized defects are closed in combined technique:
an underlay is put in between dura and bony base, the
defect is then covered with an overlay. A discus-shaped
underlay cut from septum cartilage is perfectly appropriate. Its edges can be shaped wafer thin with a scalpel so
that they easily fit into the defect. The elastic cartilage
expands intracranially and thus already allows a tight
closure that is additionally secured by an overlay of collagen tissue (Figure 9).
Bone taken from the perpendicular lamina of the septum
is also suitable as underlay, however, it is significantly
more difficult to position [208].
Injuries of the lateral lamina of the cribriform plate represent challenging technical difficulties for the surgeon.
The base has an angle that may make the positioning of
a firm underlay impossible, be that cartilage or bone.
Hereby, the method presented by PJ Wormald using a fat
plug is useful (bath plug technique) [187], [209], [210].
A possible homogenous fatty plug is adapted to the diameter of the defect and cut to a length of nearly 2 cm.
An absorbable thread that is inserted along the axis of
the transplantation allows compressing the graft intracranially and to create a tight closure even in difficult regions.
The gasket seal technique consists of covering the defect
with a soft adaptable material such as temporal fascia
or fascia lata and to push it endocranialy [211]. The
probability to cause secondary damage seems to be significant. The other, above-mentioned techniques allow a
safe closure without putting endocranial structures at
risk. We never use the gasket seal technique at the skull
base up to the sphenoid planum.
For large defects though, fascia lata is the “workhorse”.
It can be applied in single or several layers as intracranial,
intradural, extradural, or extracranial graft. It can be harvested in any size needed. Via the same approach fat
can be taken for sealing purposes (this fatty tissue,
however, is of inferior quality because of its rougher
structure compared to fat taken from the earlobe. On the
other hand, it can be taken at any quantity). The nutritive
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Figure 9: Cartilage chip as underlay, bone chip as underlay, during insertion. Covering with collagen patch.
situation of the first layer seems to be secured by CSF.
In case of multilayer closures, a vascularized transplantat
from the nasal septum is helpful. The naso-septal flap
pedicled at the posterior nasal artery, a branch of the
sphenopalatine artery, has become very popular recently.
It can be circumcised anterior to the columella, basal via
the nasal floor, if needed even via the lateral nasal wall,
and cranial up to the nasal roof. In this way a graft is
created that seems to be suitable for all defects [212].
In literature, its application is described as standard
procedure for the treatment of frontobasal defects [213]
which led to an interesting discussion. It is stated that
other procedures are not subordinate, the permanent
closure rates are equivalent. A series of situations can
be imagined where this flap is inappropriate. Among
those, there are pathological processes that include the
dorsal septum and the dorsal lateral nasal wall and
closures that have to be performed in the anterior cranial
area of the base. Furthermore, Solyar recommends
careful attention with the use of terms such as “standard”
that may have direct medico-legal implications [206].
Since the septal mucosa in the cranial and anterior parts
can be very thick and is elevated with the perichondrium,
it is likely to roll up. It may be difficult to extend it planar
over the defect and to fix it in this position. In those cases
it is helpful to delicately incise the perichondrium in longitudinal direction of the flap. This limitation leads to a
long period of postoperative wound healing. The large
de-epithelized surface of the lamina perpendicularis and
quadrangularis needs sometimes several months until
crusting decreases and functioning mucosa covers the
surface of the surgically exposed septum. If furthermore
radiation of the wound is required, the healing phase is
again significantly prolonged. A technically simple and
very effective method to meet this problem is covering
the cartilaginous surface with septal mucosa of the contralateral side [206]. The perpendicular lamina of the
septum and the vomer are abandoned, the mucosa is
circumcised, remains pedicled anteriorl at the septum
and is folded around the dorsal edge of the septum. The
free edge is then sutured to the wound edge on the side
of the defect.
Large frontobasal defects may lead to herniation of the
frontal brain. The pulsation of the brain and the mass
movement in case of cough and Valsalva manoeuver
would then press against a soft graft and probably detach
it from the underlay [187]. The application of rigid grafts
such as bone lamellas from the perpendicular lamina is
discussed in order to support the soft tissue transplantat.
If such a bone bridges the distance between the orbits,
an improved stability of the closure can be expected. The
use of fibrin glue is recommended by some authors in
order to contribute additional tightening, however,
Gassner et al. could not confirm any advantage in their
case observation [40], [214].
To achieve a tight closure by application of the endonasal
procedure, it is required to carefully prepare the underlay
for the graft after identifying the CSF leak [187].
The surgeon has to anticipate the shrinking of the graft.
The graft can shrink of up to 30% and then with a long
delay lead to CSF leakage. For those cases, procedures
with pedicled flaps from the forehead and free microvascular transplantats are described [215], [216].
Beside the standard external approach via a coronal incision and elevation of the frontal brain, the anterior skull
base can be reached through a subcranical access [61],
[217], [218]. Since hereby a broad access to the base is
created, also reconstructions after trauma can be performed beside tumor surgery without causing neurological
problems because of manipulation at the brain. Especially
for multi-fragment fractures and injuries involving nerves,
Perheentupa promotes the indication of an open approach [31], [219].
Injuries of the roof and the lateral wall of the sphenoid
sinus are predominantly observed in cases of severe
trauma to the midface [209]. Far laterally located frac-
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tures with CSF leak possibly cannot be reached via the
transseptal, transnasal, or even transethmoid approach
in cases of extended pneumatization. Here, it is possible
to reach the target structure via the transpterygoid access
[220], [221].
In case of fractures reaching the canal of the carotid
artery there is always the risk of developing a carotid
cavernous fistula [222].
Iatrogenic dural leaks are technically treated in the same
way as other traumatic defects. Their treatment belongs
to the repertoire of experienced sinus surgeons. The
special situation, also in medico-legal regard, requires
special attention. The necessary steps are described in
the chapter on complication management.
3.3.3.2 Nasal packing, postoperative care, success rate
In order to press the transplantat to the wound base, to
avoid bleedings, and to avoid pneuencephalon when incidentally blowing the nose, packing, absorbable or fragmenting substances or balloons are applied [171]. No
scientific evaluations exist for none of the procedures in
the context of traumatology. For more details, the paper
on R. Weber in this issue is recommended.
In about 90% of the cases the closure is successful after
the first endonasal approach [171], [223], even 97% including revision surgeries. In a meta-analysis of 1,778
surgeries of dura fistulas, Psaltis and co-workers found
a complication rate of only 0.03% [204]. Another metaanalysis published by Hegazy et al. reported about a very
low number of complications. Meningitis was observed
in 0.3%, brain abscess in 0.9%, subdural hematoma in
0.3%, disturbed olfaction in 0.6%, and headaches in 0.3%
[171]. The complication rate for the endonasal approach
is lower than for the transcranial one with 3.2 vs. 12.9%
[40], [187], [205], [207]. Recurrences are expected after
a median follow-up time of 4 years [40]. The special
situation in children was evaluated by Di Rocco in 2010
[14], [188].
Traumatic encephaloceles and meningoceles are rare.
In the area of the anterior skull base, the surgical treatment is technically easy. Here, the diagnosis is the relevant step for therapy. Celes may be easily misinterpreted
as lesions of the ethmoid sinuses. If they are not diagnosed correctly, a usual ethmoid sinus surgery may lead
to complications. In cases of defects of the bony base
always a cele must be suspected. The glioma tissue in
the encephaloceles never has function and is removed
with the cele sac. The surgical principle for both pathological lesions is the same.
3.3.3.3 Antibiotic therapy
The perioperative application of cephalosporin e.g. is a
widely accepted procedure [187]. In a meta-analysis
Hegazy et al. found the perioperative application of antibiotics in 94% of the duraplasties [171]. Furthermore,
the local application of clindamycin in the nose during
surgery is recommended. For long-term application of
antibiotics for prophylaxis, different time spans are
mentioned in the literature [224], [225]. However,
meanwhile there are more doubts regarding prophylactic
application of antibiotics [226] so that it is no longer recommended [226], [227].
3.3.3.4 External lumbar CSF drainage
In order to reduce the CSF pressure on the transplantation
after frontobasal duraplasty and to thus favorably influence the healing, different authors recommend external
lumbar CSF drainage [171]. Other authors do not see any
difference in the rate of inconspicuously healed duraplasties [175], [223]. A clear definition of the indication
was not established up to now, moreover the application
seems to depend on the preferences and the experience
of the surgeon. An indication that has a clear logic beyond
vague recommendations such as “larger defects” or
“difficult graft site” are cases of hydrocephalus. This
diagnosis seems apply for unsuccessful defect covering
and benefits from CSF drainage [171].
CSF should be drained with 5–10 ml per hour. The position of the drainage sac must be carefully controlled. If it
is too high, air may ascend retrograde and a pneuencephalus develops. If it is too low, too much liquor is drained
and pinching may occur. Some authors recommend
drainage for 120 hours. However, there seems to be no
clear advantage of drainage lasting for more than
24–48 hours. Strict bedrest should be kept so that no
CFS pressure peaks occur [187].
Acetazolamide reduces the CSF production by 48% and
so it is an interesting pharmacological option to reduce
the CSF pressure. If this possibility is an alternative to
lumbar CSF drainage that should be considered seriously
in the patients described here, has not been examined
[228].
3.3.4 Summary
Skull base fractures with CSF leak pose a high risk of
ascending meningitis with neurological defects. Even
after up to 20 years, cases of late meningitis after frontobasal fracture are described so that the indication to
surgery can also be made if CSF leak spontaneously
stops.
Iatrogenic dura leaks are technically treated in the same
way as other traumatic defects. Their treatment belongs
to the repertoire of an experienced sinus surgeon.
3.4 Orbital fractures
3.4.1 Epidemiology, pathogenesis,
classification
Fractures of the orbital floor occur either in the context
of fractures of the zygomatic bone complex and other
midfacial fractures or as isolated findings. In case of an
isolated fracture of the orbital floor bony fragments are
dislocated caudally into the maxillary sinus [13]. In case
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of relevant defects of the orbital floor, periorbital tissue
prolapses from the orbit into the maxillary sinus. Because
of the loss of periorbital tissue, the bulb sinks back into
the orbit. In case of bigger defects of the orbital floor,
even dislocation of the bulb into the maxillary sinus may
occur [229].
3.4.2 Clinical symptoms
Clinical symptoms of orbital fractures are hyposphagma,
epistaxis, sensitivity disturbances in the area of the infraorbital nerve, enophthalmus, hypophthalmus, diplopia,
disturbed eye motility, rounded canthus (cow’s eye) in
case of ruptured canthal ligament [18]. The symptom of
black eye can be caused by conducted bleedings from
the depth of the orbit or by superficial ecchymosis of the
eyelids. The symptom alone is not a direct hint of a fracture. However, in 68% of the cases, a radiologically detectable fracture must be expected.
The following symptoms and situations lead to an emergency situation: partial or complete loss of vision,
massively increased intraocular pressure, exophthalmos
with hint of acute tumorous lesion within the orbital pyramid (retrobulbar hematoma, emphysema), severe dislocation of the orbital content (e.g. into the maxillary sinus),
pinching of the ocular muscles (especially in children,
“trap-door” effect).
3.4.3 Radiological diagnostics
For radiological diagnostics of fractures of the orbital floor
2-dimensional radiographs were performed traditionally.
Prolaps of orbital fatty tissue into the maxillary sinus is
visible as hanging drop in typical imaging of the
paranasal sinuses. In order to asses the exact extent of
a defect, multiplanar CT scan or cone beam imaging is
recommended [54].
3.4.4 Indication, therapy
Fractures without dislocation are only treatment-worthy
when there is a hint of space-demanding intraorbital
bleeding or compression syndromes of the nerves. A
fracture can lead to an orbital compartment syndrome
with vital threat to the eye even without dislocation. The
temporary compression of the 2nd branch of the trigeminal
nerve or the optic nerve can cause temporary or persistent damage [54], [230], [231]. If these symptoms are
missing, inspection of the orbital floor is not performed
so that risks of surgery do not materialize. In this context,
especially the damage of the infraorbital nerve and the
optic nerve must be mentioned as well as persisting
edema of the lower eyelid, impaired vision (occurrence
of diplopia caused by bleeding or swelling), ectropion or
entropion, and even blindness [20], [30], [232], [233].
The decision of conservative therapy is made on a safe
diagnostic basis because secondary corrections of consolidated contour or volume changes in the area of the
orbit are difficult and often they are not completely possible [13].
In case of impaired vision due to intraorbital increase of
pressure, an immediate intervention is required. The first
measure is lateral canthotomy and cantholysis. If the
pressure relief is insufficient, additional measures must
be taken [234], [235].
Bleedings and edematous swellings within the orbit that
is encompassed by the orbital septum in anterior direction
lead to disturbances that mostly proceed according to
the following rules: disturbed red color perception, loss
of vision, restricted visual field. Furthermore the exposition of the orbital floor is indicated in cases of functionally
significant defects, mechanical impairment or pinched
optic muscle, enophthalmos, and persisting diplopia. Indications of immediate surgery are: enophthalmos,
sunken bulb, oculo-cardial reflex that does not improve,
and white-eyed blow-out fracture. Burnstine recommends
surgery within 2 weeks in cases of diplopia with positive
force-duction test, symptomatic enophthalmos, radiologically proven pinching of the orbital content, and fractures
that exceed a size that enophthalmos becomes likely
[18], [232].
The surgical access to the orbital floor is usually performed in a transconjunctival or transfacial way in the
area of the lower eyelid. By means of this incision, a good
exposition with the possibility of extension and favorable
postoperative scarring is possible. In rare cases, it is
helpful to expose the orbital floor via the maxillary sinus
[12]. The endoscopic diagnostics is applied in order to
identify the dorsal edge of the fracture of the orbital floor,
to position a balloon transnasally, to reconstruct the
medial wall with a transconjunctival approach, and to
reconstruct transantrally the orbital floor with titanium
meshes, polyethylene, or absorbable sheets. The most
frequently used access is performed via the oral vestibule
[23], [233].
After exposition of the orbital floor, the fracture is repositioned and if necessary it is fixed with an osteosynthetic
plate.
In case of defects of the orbital floor, the prolapsed orbital
tissue is repositioned in first place. Hereby the peculiar
anatomical shape of the floor has to be taken into account. In a parasagittal plane, the contour of the floor
describes a typical S shape. This course of the floor must
be reconstructed in order to correctly reestablish the
anatomical shape and the volume of the orbital skeleton
[54]. The support of the orbital floor with a balloon inserted from the maxillary sinus (Milewski antral balloon) or
with consecutive ointment packing [84] is no longer recommended.
In the AO Surgery Reference, the special significance of
the transition zone from the orbital floor to the medial
orbital wall and the most distally located parts of the orbital floor are emphasized [54]. In some cases decompression of the infraorbital nerve is required to free the
nerve from dislocated fragments.
A variety of materials are recommended for reconstruction
of the orbital floor, [12], [50]. Among those, there are
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autogenic bone, alloplastic materials such as sheets
made of polydioxanone (PDS), polyglycol polylactid and
porous polyethylene as well as titanium mesh [13]. For
very large and complex defects, also pre-shaped titanium
mesh is applied. Their design is based on average
measured values of the normal population. If they fit well,
they may reduce time of surgery significantly.
Fractures of the orbital roof usually remain without consequences unless bone fragments pierce into the orbit.
However, cases of oculorrhea are described where liquor
is pressed from the subarachnoid space of the frontal
brain via a dural fistula into the orbit and causes a
pseudo-meningocele in the eyelid. In rare cases, liquor
may find its way via the conjunctiva and thus appear as
tears [203].
Fractures of the ethmoid sinus and the orbital lamina
may lead to diplopia at temporal gaze by pinching the
medial rectus muscle. They are identified by radiography
and forced-duction test. Surgery is indicated [236].
In any surgery of the orbital floor, the forced-duction test
ensures that no tissue incarcerations are overlooked.
Pre- and postoperatively controls of vision are recommended.
Injuries of the ocular bulb as well as direct lesions of the
external eye muscles are not focused on in this paper.
They are dealt with in ophthalmologic literature. Rhinologists and maxillofacial surgeons caring for trauma patients, however, have to know about the different lesions
that may follow even in cases of externally intact eye.
Beside luxation of the lens [237], in particular also retinal
detachment must be mentioned [238].
4 Le Fort fractures
4.1 Epidemiology and pathogenesis
Le Fort fractures belong the central (Le Fort I and II) and
centro-lateral (Le Fort III) fractures of the midface [13],
[18], [17]. Isolated Le Fort I, II, and III fractures are very
rare [54]. The classical description of Le Fort fractures is
based on a symmetric arrangement of the fracture lines
on the right and left side. In reality, however, the various
fracture patterns occur in different combinations. They
can also appear as isolated findings or in combination
with other bony lesions of the skull which lead to different
fracture patterns. If sagittal or transversal fractures of
the maxilla are observed additionally, the fracture patterns become even more complex [13].
The reason for central or centro-lateral fractures is a direct
trauma with high impact to the maxilla (Le Fort I fracture)
or to the whole midface in most cases (Le Fort II/III fractures) [117]. Etiologically, traffic and sports accidents as
well as interpersonal violence are on top of the list of
different trauma situations [111], [118], [119].
4.2 Clinical symptoms
Unspecific clinical symptoms that are observed in all three
Le Fort fracture types are lesions of the skin and soft tissue, swellings, and hematoma of the midface [14]. A
typical symptom is also bleeding from the nose because
of involvement of the nasal septum and the mucosa of
the paranasal sinuses. Another important and frequently
found symptom is the impaired occlusion as all Le Fort
fractures may dislocate the maxilla. The dislocation occurs
in distal direction mostly often and can be even increased
by traction of the pterygoid muscles [17]. Because of
early contact in the area of the molars, a frontal open
bite may result.
In cases of Le Fort I fractures, the maxilla is mobile typically. Pressure sensitive steps can be palpated intraorally
in the area of the paranasal pillars and the zygomaticoalveolaris crest on both sides. Bleedings in the area of
the mucosa of the maxillary vestibule may be another
sign of fracture.
Binocular hematoma is typical for Le Fort II fractures [14].
Palpable steps are found in the area of the intraorbital
rim and intraorally in the area of the zygomatico-alveolar
crest. Damage of the infraorbital nerve regularly leads to
disturbed sensitivity in the area of the frontal teeth, the
upper lip, the cheek, and the skin of the lateral nose. If
the central midface is dislocated in dorsal and caudal
direction, the typical appearance of “dish face” with
missing projection of the nose is found. Rhino-liquorrhea
indicates involvement of the anterior skull base.
Le Fort III fractures are characterized by separation of
the facial skull off the skull base. Typical symptoms are
massive swelling and bleeding from the nose and mouth,
binocular hematoma, flattening and broadening of the
midface, disturbed occlusion, palpable steps latero-orbital
and frontal as well as rhino-liquorrhea. The orbit is always
involved. Disturbed sensitivity may concern all branches
of the trigeminal nerve because of an involvement of the
skull base [17].
4.3 Radiological diagnostics
Current standard in imaging diagnostics of midfacial
fractures is computed tomography. Only the assessment
of the fractures in all three planes exactly reveals the
courses of the fractures and relevant concomitant lesions
[14], [54]. The sections of CT diagnostics should be
2–3 mm or less for midfacial fractures and 1 mm for orbital fractures [54]. Cone beam tomography (CBT) is
generally also suitable to accurately depict the fracture
courses of midfacial fractures in 3 dimensions. However,
this technique still has relevant disadvantages for an
assessment of soft tissue lesions. Nonetheless, CBT is
widely accepted because of low radiation exposure uncomplicated intraoperative and postoperative application
[31], [139], [161].
In all Le Fort fractures, the fragments may be simply
fractured or comminuted [54].
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4.4 Surgical indications
Le Fort fractures are treated either in a closed or open
way. Depending of the degree of dislocation, the extent
and pattern of the fracture, the type and severity of concomitant lesions as well as clinical symptoms, the indication of immediate therapy is made. Even if no emergency
indication is apparent, the surgical treatment should be
performed within at least 2 weeks. The interval between
7 and 10 days is considered as optimal because at that
time typically the swelling is clearly reduced [14]. Secondary corrections in the area of the midface are generally
more complex and more difficult to be performed and
often they do not lead to satisfactory results.
Exceptions are not dislocated, not or minimally mobile
Le Fort fractures without disturbed occlusion or with
toothlessness. In this context, there is no indication for
surgery. However, the compliance of the patient has to
allow such a procedure [54].
4.5 Therapy
The basic principle of treatment consists of an accurate,
anatomically correct reconstruction and securing of the
bony structures in all three dimensions.
In cases of closed treatment of Le Fort fractures, the
dislocated fragments are repositioned without exposing
the fracture lines and after reaching the target position
they are fixed in their position by mandibulo-maxillary
fixation (MMF) and/or wires to further cranially located
stable bones [17]. Today this technique of wire suspension is only rarely applied. The closed treatment by MMF
and elastic tractions, however, is regularly applied in
minimally dislocated and also after reposition of stable
Le Fort fractures and in patients with reduced operability.
The closed reposition can also be indicated in acute
situations for reduction of bleedings and CSF leaks, especially in the context of severely dislocated Le Fort II and
Le Fort III fractures [54].
Hereby it must be considered that the maxilla has the
tendency to deviate in distal direction because of the
traction of the pterygoid muscles. Even MMF cannot safely
inhibit that the maxilla is later in a too distal position
leading to class III malocclusion. The muscular forces can
be strong enough to move the mandibular joints dorsally
into the external articular canal. After releasing the MMF
and sinking back of the head of the mandibular joint, the
maxilla can be in a too distal position in relation to the
mandible [54]. Hence it is important to mobilize the
midfacial fragment in a way that the maxilla is passively
positioned in the correct position. For this purpose special
instruments such as Rowe’s forceps, Strohmeyer’s hook,
and mobilization instruments according to Tessier are at
disposition [54], [17].
In cases of Le Fort I fracture, generally an intraoral incision to expose the fracture line is applied and the
maxilla is stabilized after reposition in correct occlusion
by means of 4 miniplates in the area of the anterior
midfacial pillars (lateral to the piriform aperture, on the
zygomatico-alveolar crest). In case of larger bony defects
after midfacial comminuted fractures, sometimes bone
transplantats have to bridge the defects in the area of
the trajectories.
In Le Fort II fractures, the fracture lines are usually exposed in the area of the zygomatico-alveolar crest, in the
area of the orbital rim, and if needed also in the area of
the nasofrontal region and fixed by means of miniplates.
Intraorally, the fracture area is reached via the classical
sulcus incision in the maxillary vestibulum and the infraorbital edge is exposed via different transfacial or
transconjunctival incisions. The nasofrontal region can
be exposed by trauma given access, an incision in the
area of the glabella, or the coronal incision. The process
of surgical treatment of a dislocated Le Fort II fracture
consists of the exposition of all relevant fracture areas,
the mobilization and correct reposition of the fragments,
stabilization of the correct occlusion via MMF, and application of osteosynthetic plates in the end. If necessary,
relevant areas are augmented [14]. An alternative to
cover the defects and to reconstruct comminuted zones
consists of applying titanium meshes [13]. Finally the
correct occlusion has to be verified [54].
In the context of surgical treatment of Le Fort III fractures,
the facial skull in the nasofrontal and zygomatico-frontal
area must be secured to stable bony structures of the
neurocranium after reposition [17]. For the correct
sagittal position of the midface the reconstruction of the
zygomatic bone structures is of great significance. For
exposition and osteosynthesis in these areas, a coronal
access may be required.
4.6 Traumatic neuropathy of the cranial
nerves (CN)
Lesions of the cerebral nerves are mostly associated with
skull base injuries. In 50%, extracranial neurological
complications are found [11]. Injuries of the skull rank
third in the origins of uni- or bilateral anosmia [239]. If
cerebral nerves are part of the injury, most frequently the
2nd trigeminal branch and the olfactory nerve are concerned, followed by the facial nerve and the nerves of the
eye muscles III, IV, and VI. Those nerves are more likely
to recover than CN 1 [240]. In 12.8% of cranio-cerebral
injuries, olfactory dysfunction must be expected, in rhinobasal fractures with CSF leak anosmia can be expected
in 27.5% [205], [241]. Trauma to occiput leads more often to anosmia than frontal trauma [242]. The reason
may be the direct lesion of the olfactory bulb or the rupture of olfactory fibers at the cribriform plate, bleeding
into the olfactory fibers, or contusion of the olfactory bulb
and tract [20]. Even a mild head trauma can lead to a
temporarily impaired olfaction [243]. Early psychometric
diagnostics should be performed in order to meet medicolegal questions by reliable findings after surgery.
In 50% of traumatic dysosmia, a complete bilateral
anosmia is found. In 20% the anosmia is unilateral, in
the other cases, hyposmia is diagnosed. The prognosis
of hyposmia is good, the one of anosmia is poor [242].
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Only 11.3% and 2.3% completely recover from anosmia
and hyposmia, respectively. The origin of the lesion in
this context is unimportant [244].
The oculo-motor nerve is injured either within the orbit
or in the superior orbital fissure. Isolated lesions of CN
III are very rare in cases of closed cranio-cerebral trauma.
Nonetheless, also in mild closed head injury without
concussion paresis of CN III may occur [245]. MRI can
sometimes reveal an enhancement and swelling in the
cisternal course of the nerve [246], [247], [248]. Clinical
signs are ptosis, mydiasis, and impaired motility of the
ocular bulb. The following developments possible: no
improvement, regeneration, and aberrant regeneration
that may lead to paradox eye movements. This is typically
elevation of the eyelid when trying to look downwards,
further the inadequate pupil motor activity can be
triggered by change of the line of sight. Sebag describes
a patient who was blind in the affected eye, had no pupil
reaction on accommodation or consensual luminous
stimulus, and when looking downwards, myosis was
triggered [249]. Penetrating lesions may directly injure
all nerves of the orbit and lead to an orbital apex syndrome [250].
Isolated lesions of the trochlear nerve are rare. They
mostly occur in combination with lesions of the oculomotor nerve. The location of injury is in the temporal bone
and pterygoid process or endocranially at the tip of the
petrous bone. The failure of the superior oblique muscle
adducting the globe in caudal direction leads to vertical
diplopia. Spontaneous remission 3–6 months after
trauma is described [18], [251].
The 6th cranial nerve can be injured in its long intracranial
course by fractures of the skull base mostly in the area
of the petrous bone [252], [253]. Furthermore, lesions
caused by increased cerebral pressure are possible.
Epidural hematoma for example may be the reason.
Nayil describes a case where an epidural hematoma at
the apex leads to bilateral paresis of the CN VI [254].
Fractures in the area of the lateral orbital wall may also
lead to disturbed abduction. Clinically, the damage can
easily be proven by abduction deficit. Indirectly, a traumatically induced carotid cavernous sinus fistula may be
the origin [36].
Lesions of the optic nerve are important for rhinologists
because the optic nerve in its extracranial course can be
reached by endonasal surgery. The different partly controversially discussed aspects will be described in the
following. The ophthalmologic and neurosurgical aspect
of this topic will not be focused on and only be mentioned
where it is necessary to reasonably explain the rhinologic
field of activity.
In about 5% of closed head injuries, the optic nerve is
damaged. The consequence may be a permanent loss of
vision. Since the pathophysiology of the lesion of the optic
nerve by blunt trauma is only incompletely understood,
therapeutic recommendations are based on analogies
from the field of traumatology [255].
In up to one fifth of severe fronto-basal lesions, traumatic
lesions of the optic nerve are observed [256]. Midfacial
fractures are associated with loss of vision in one eye in
1.2% of cases [257]. An acute visual loss is found in 1.7%
of cranio-cerebral lesions with involvement of the eye
[258]. In half of the cases, the visual loss persists [259].
4.6.1 Anatomical particularities of the optic
nerve
The optic nerve is a part of the diencephalon and belongs
to the white matter of the brain. Therefore it is covered
by three cerebral membranes that encompass it in its
course with different thickness. The optic canal itself is
lined with periost that passes on at the cerebral side to
the dura mater, at the orbital side to the periorbit and
the dura of the optic nerve. The pia mater firmly adheres
to the nerve and accompanies it from the chiasm to the
entrance into the bulb. The dura mater continues in the
periostal lining. Also the arachnoid accompanies the nerve
in its whole length. On the way through the canal, the
membranes are closely connected to each other, the
subarachnoid spaces containing fluid are very narrow.
Consequently, osseous deformities of the pterygoid are
transmitted directly to the nerve [260].
For about 1 mm, the optic nerve has an intraglobal
course. Only in cases of very intensive trauma, avulsion
injuries occur. There is no therapy in those cases
(Figure 10).
More frequently, nutritive disturbances are found because
of damaged ciliary arteries [258].
The intraorbital part measuring 25–30 mm, the nerve
has an S-shaped course. There is some spare length that
allows movement of the globe. Lesions in this area are
caused either by piercing of bone fragments and foreign
bodies or development of increased pressure intraorbitally
in the sense of an orbital compartment syndrome.
The nerve is at highest risk in its 6–8 mm intracanalicular
course. At the entrance into the canal, the nerve is surrounded by the anulus of Zinn (also known as annular
tendon or common tendinous ring). In 40% the ophthalmic
artery enters medial to the optic nerve into the dura canal,
in 35% in the middle below the nerve, and in 25% lateral
below the nerve, in 85–90% it runs inferolateral of the
nerve through the bony canal, in the other 10–15% of
the cases, however, it runs medial and is potentially at
risk during decompression surgery. If it is transsected,
vision is lost [261].
Regarding the surgical technique, the course of the optic
nerve through the dorsal ethmoid bone and the sphenoid
sinus is important. Only if a sufficient pneumatization
exposes the nerve in the sphenoid sinus, an endonasal
endoscopic intervention can be performed. Special attention must be paid to sphenoethmoid cells as in 10–15%
of cases they expose the nerve [107].
4.6.2 Epidemiology and etiology
The most frequent causes of traumatic lesion of the optic
nerve are traffic accidents, to an increasing rate also bike
accidents, but also violence and falls. In 50% of cases,
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Figure 10: Avulsion injury. MRI: The arrows indicate bleeding into the location of rupture of the optic nerve (contralateral most
severe contusion injury of the bulb).
Table 5: Patterns of injury of the optic nerve according to Walsh [263]
initial unconsciousness is observed. If loss of vision occurs, it is mainly immediately together with the trauma
[262]. A blunt concussion is transmitted from the cranial
bone to the canal of the optic nerve. Direct intraorbital
or intraocular lesions of the optic nerve are mostly a sequel of sharp injuries as for example cutting damage or
gunshot wounds. Dissection of the optic nerve is irreversible and therapy is not possible. The difference must be
made regarding indirect damage of the optic nerve in its
orbital course caused by increased pressure in the orbital
compartment. If the pressure within the orbit is greater
than perfusion pressure especially of the ciliary arteries,
an ischemic disturbance occurs that can be reversible if
it is treated in time.
The classification of lesions according to their pathophysiology and injury patterns is based on Frank B Walsh.
It provides an orientation of the therapeutic consequences [263] (Table 5).
The traumatic optic neuropathy (TON) roughly follows this
pathomechanism. The trauma causes an arterial compression or spasms leading to ischemia that results in
an intraneural edema and necrosis of the optic nerve. So
it is plausible to claim for decongesting and space-creating measures in order to prevent further damage [264].
Beside the indirect damage of the optic nerve in its canal
by pressure, other trauma patterns of the nerve must be
considered. An intraconal retroglobal hematoma may
lead to ischemic damage of the nerve and thus to the
loss of vision via the compression of the ciliary arteries
surrounding the optic nerve. More frequently than traumatic neuropathy of the optic nerve, retroglobal hematomas and ruptures of the globe cause a loss of vision. The
mechanism of the accident plays a more important role
than the fracture pattern regarding the type and extent
of the trauma [258].
Carta identified blood in the dorsal ethmoid cells, age
greater than 40 years, and unconsciousness as prognostically relevant risk factors regarding vision [265]. Panja
could reveal primarily the following factors as prognostically unfavorable: complete loss of vision, intervention
later than 7 days after trauma, missing response in the
visually evoked potentials, and radiological evidence of
fracture fragments at the roof of the sphenoid sinus
[266].
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Figure 11: Foreign body of the orbit. In the CT scan the biological material is detected as gap. The foreign body caused a minimal
wound when penetrating (arrow in the left image). It was stopped in the orbital tip. Removal via an endonasal approach.
4.6.3 Diagnosis
In order to diagnose afferent lesions, psycho-ophthalmological and neuro-ophthalmological procedures are at
disposition that are highly reliable in cooperative patients.
In case of severely injured patients, the reliability reduces
to 30%. Gellrich and co-workers recommend a diagnostic
algorithm that refers to the findings of visual evoked potentials (VEP) beside computed tomography [267].
Polytrauma patients generally are not able to undergo
exact ophthalmological diagnostics. Two thirds of patients
with TON are unconscious at the time of referral. Therefore psycho-physical diagnostic means are not appropriate. Onset of visual loss is hard to find out exactly though
it is of paramount importance to estimate prognosis.
Objective procedures that do not require the patient’s
cooperation are not exact enough for the scientific analysis of therapeutic procedures in cases of TON.
The significance of electrophysiological diagnostics
(visually evoked potentials and electroretinography) [268]
as basis of surgical indication is discussed controversially
even if flash VEP can be applied in patients that are not
able to cooperate [269], [270].
The only prognostic criterion that receives broad consensus in the literature is the initial vision at the time of
trauma.
An ophthalmologist should always be involved in the
diagnostic procedures.
A possible order of clinical diagnostics may be the
procedure suggested by Luxenberger [260]:
• Computed tomography, thin-layer of 1 mm, multiplanar
reconstruction in the context of cranio-cerebral trauma
diagnostics.
• Measurement of the ocular pressure.
• Swinging flashlight to identify a relative afferent pupillary deficit (RAPD).
• Ophthalmometry (Hertel exophthalmometer) to detect
a unilateral bulbar protrusion.
• Fundoscopy: typically, the pupils and the retina are
inconspicuous during the first weeks after trauma. The
atrophy of the optic nerve only follows after 3–4 weeks.
Circulatory disorder, however, may become apparent
earlier.
• Recording of visual acuity, color vision (red is the first
quality to fail), and perimetry if the patient is able to
cooperate.
• Flashlight VEP (visually evoked potentials) in unconscious patients.
The best functional test in the clinic is visual control and
perimetry. Whenever possible, it should be repeated in
intervals and be documented exactly. The mobility of the
globe and reaction tests of the pupils are also obligatory
parts of ophthalmological diagnostics.
With procedures described here, mostly no sufficiently
safe statement about the condition of the optic nerve can
be made in polytrauma patients. In order to find an indication for such far-reaching measures such as pharmacotherapy with high-dose steroids or surgery at the tip of
the orbit, at least for medico-legal reasons a possibly reliable finding of the optic nerve function is required. The
recording of visually evoked potentials (VEP) can also be
performed in unconscious patients and with shut eyelids
so that hints on the function of the optic nerve can be
gained [271], [272]. However, there are serious limitations of the procedure [268], [269], [270], [273]. Regarding the two procedures of standard diagnostics, pattern
VEP must be excluded because it requires the patient’s
cooperation.
Direct lesions, caused by penetrating foreign bodies, canal
fractures, hematoma, or compression of dislocated bone
fragments can be assessed by CT diagnostics [274]. MRI
findings can be helpful for diagnosis of avulsion injuries
and hematomas of the optic nerve sheath, axonal injury,
and ischemia. They are obligatory for fractures concerning
the canal of the optic nerve [30] (Figure 11).
MRI must only be performed if metallic foreign bodies
have been excluded because they might cause additional
damage of the orbit because of the strong magnetic field.
CT diagnostic cannot detect fractures with sufficient reliability unless they are dislocated. The elasticity of the
bone can lead to a temporary compression and immediate
recovery of the tissue. So the anatomical findings at the
time of CT scan do not necessarily depict the full extent
of bony lesions. Hematomas of optic nerve sheaths or
swellings cannot be reliably detected or excluded by MRI.
An uncertainty remains in the diagnostic algorithm that
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must be taken into consideration when interpreting
studies. CT diagnostic, however, is a relevant part in the
context of surgical planning, for the reason alone to define
the transnasal approach to the optic nerve.
4.6.4 Indication, time of intervention
In literature, mainly three therapeutic approaches or
combinations of these respectively are discussed. Corticosteroids in various dosage, surgical decompression
of the nerve in its canal, and spontaneous improvement
of the situation.
There is no sufficient evidence for any of the said therapeutic regimes to be superior to others. For methodological reasons there is no change in sight [275]. Main issues
in the context of a treatment concept is to define a time
interval in which therapy, especially surgery, should be
recommended, wether or not application of corticosteroids is helpful or even counterproductive, and if decompression of the bony canal alone is sufficient – if a benefit
can be expected at all – or if the optic nerve sheath
should be incised as well [276], [277].
It is general consensus that in cases of orbital compartment syndrome the indication for surgical decompression
is to be made generously. Bleedings and edematous
swellings within the orbit delineated by the orbital septum
in anterior direction can lead to a limited vision of red or
an impaired visual field and to reduced vision. In those
cases, immediate intervention is required. The first
measure is the lateral canthotomy and cantholysis. In
cases of insufficient pressure relief, additional measures
must be taken [234], [235]. As emergency procedure still
in the emergency room, lateral canthotomy with cantholysis can also be performed under local anesthesia. Drug
therapy must not delay surgical relief [278], [279]. Lower
eyelid release indicates the correct performance of the
intervention. In the further course, the endonasal technique of orbital decompression represents the gold
standard and is a routinely performed procedure for experienced sinus surgeons [278], [280], [281], [282],
[283]. By enlarging the volume of the orbit, on the one
hand further pressure relief is achieved, on the other
hand the traction of the optic nerve is reduced when
cantholysis led to proptosis. The optic axis changes as
an effect of this procedure and postoperative strabismus
results.
The prognosis of vision mainly depends on the dynamics
of visual acuity after the trauma [262]. If it is possible to
assess the dynamism of the injury, the indication should
be made as follows:
In case of immediate loss of vision (i.e. concussion of the
optic nerve, primary pressure necrosis, laceration of the
nerve or chiasm), surgery should not be performed. Concussion of the optic nerve does not require surgery because it may recover spontaneously, in case of the other
said pathologies, vision is lost. The situation is quite different when the loss of vision is delayed: if the swelling
of the nerve leads to hypoxemia, an intervention seems
to be promising [263].
Secondary blindness, intracanalicular lesion, dislocated
bone fragments, increased pressure in the orbit (orbital
compartment syndrome) should call for surgical measures.
Some authors claim that intervention should be performed within 8 hours to be successful [284]. On the
other hand numerous cases are reported that recovery
of vision is found even after longer intervals [283].
4.6.5 Conservative therapy
Some authors decline any specific therapy but await the
spontaneous course of the disease. 20–60% of the patients experience an improvement of their vision [285],
[286]. Since it was not possible to find an evidence for
the effectiveness or superiority of the treatment with
steroids or surgery compared to wait-and-see, the risks
associated with therapy should be avoided [287].
In order to create a reasonable basis for therapeutic decisions regarding vitally threatened vision, clear and understandable guidelines are needed. In a meta-analysis
of the literature available up to 1996, Cook and coworkers drew the conclusion that therapy with steroids
and surgery are superior to wait-and-see. However, they
admitted that methodical problems do not allow a final
statement. They mentioned further an international study
by the same authors on the topic that was not been finished at that time [285]. With regard to this study, a bias
of time between trauma and inclusion into this study must
be taken into account [284] (Table 2). Later publications
do not see an advantage of steroid therapy, they rather
mention the risks and recommend wait-and-see.
Corticosteroids are applied since 40 years in traumatic
lesions of the optic nerve [287]. The results of lesions of
the central nervous systems in animal trials were transferred to the optic nerve in humans as the ON is part of
the brain as well [288]. A neuro-protective effect was expected because of the antioxidative effect and an inhibition of lipidperoxidation induced by free radicals. Due to
the low pharmacological correlations and the effective
inhibition of the inflammatory cascade, methylprednisolone is preferred to other representatives of corticosteroids.
The clinical recommendation of steroid therapy is based
generally on the National Acute Spinal Cord Injury Study
(NASCIS II and III) [276], [286], [289]. The recommendation is given in this study that therapy should be initiated
within 8 hours. The results and especially their transferability to TON, however, are still and persistently discussed controversially. A significant difference in outcome
of the motor fibres was found, however, not of the sensory
fibers. Furthermore, in the NASCIS study methodical
ambiguities were seen (randomization, post-hoc analysis
of a small subgroup for the actual statement on early
treatment of spinal cord injuries) that limit the value
[276], [290], [291], [292].
In a randomized, double-blind, and prospective study,
Entezari and co-workers evaluated the effect of high-dose
steroid therapy (250 mg prednisolone i.v. every 6 hours
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for 3 days, afterwards 1 mg/kg body weight of prednisolone for 14 days) compared to placebo in 31 patients
with unilateral indirect TON. All patients were included
into the study within 7 days after trauma. As explained,
this is may pose a typical problem of studies on this topic:
the time between injury and onset of therapy amounted
to 6 and 168 hours. The effect of spontaneous remission
could be encompassed in different measures into the
one or other group. Furthermore, patients with missing
light reaction were included in the same way as patients
with mostly intact vision. Regardless those methodical
pitfalls, the authors could not reveal a significant difference between in the therapy groups [293].
A double-blind, randomized, and placebo-controlled study
on the effectiveness of mega dose therapy with methylprednisolone of cranio-cerebral trauma patients regarding
their survival (Corticosteroid Randomization After Significant Head Injury, CRASH-study) should include 20,000
patients originally. After 10,008 patients had been included the ethical committee stopped the study because
it became obvious that the survival in a 6-months followup was worse in the verum than in the placebo group. In
the analysis performed by Roberts and co-workers, a
higher mortality within 2 weeks after the accident was
found in the group treated with methylprednisolone [294].
These results have to be taken into consideration for the
frequently observed patients with cranio-cerebral injuries
with TON [295].
In a review of the Cochrane Collaboration, Yu-Wai-Man
and Griffiths draw the conclusion that no convincing data
are present showing a superiority of steroid therapy in
comparison to mere observation of the clinical course.
Reviewing 247 publications, however, none was found
that would have met the formal criteria demanded by the
Cochrane Society. Nonetheless, some studies and case
reports were discussed, among others the paper of Cook
and co-workers that was already cited here. All those investigations seem to be methodically limited. For the
situation of spinal cord lesions, Bracken wrote a new
Cochrane review in 2012. He concludes that high-dose
methylprednisolone is the only treatment option that has
an impact on the remission of, however, only motor
neurons [296].
Especially in intensive care patients, the side effects of
high-dose or mega-dose methylprednisolone therapy must
be considered [255], [297]. Beside gastro-intestinal
complications, diabetogenic effect and steroid psychosis,
in particular the immuno-suppressive effect with the risk
of nosocomial infections must be taken seriously [298].
The case wether or not therapy with growth factors is
helpful, cannot be determined at present. Animal experiments seem to indicate this direction [299], [300]. First
clinical reports show positive effects, but they are characterized by the same methodical problems as other studies
on said therapeutic procedures [301], [302].
4.6.6 Endonasal, transorbital, or neurosurgical
pterional decompression
In the thirties of the last century, Sewall, Dandy, and
Pringle were the first to describe decompression of the
optic nerve. During the world wars, the fronto-temporal
approach became standard, only afterwards, the transtemporal, transorbital, transfronto-intra- and extradural,
transnasal, and transethmo-sphenoid approaches were
developed [274], [284], [303].
The transethmoid access has the advantage of rapid
wound healing compared to the transcranial access. The
olfactory bulb is protected, the surgical stress is lower
which is very important in polytrauma patients requiring
intensive care, and no visible scars result [304], [305].
If the optic nerve can be sufficiently exposed in the ethmoid and sphenoid sinus, if no contraindications exist,
and if no neurosurgical procedure actually requires the
transcranial approach anyway, the endoscopic transnasaltransethmoid access is widely accepted [306]. In the
same way, an orbital compartment syndrome can be relieved [260]. The surgical decompression of the nerve
also provides a chance of improved vision as salvage
measure if conservative therapy failed [286], [307].
Performed by an experienced surgeon, the intervention
can be judged as being safe and low in risk. Beside the
typical risks of endonasal sinus surgery, the patient has
to be informed about a possible lesion of the ophthalmic
artery, parts of the nerve by slitting the sheaths, CSF leak,
and meningitis. Different authors avoid the transection
of the annulus of Zinn and the slitting of the sheath of
the optic nerve in order not to run the risk of causing CSF
leak or damaging neural fibers iatrogenically [277], [307],
[308]. If a sufficient decompression of the nerve can be
achieved without opening the sheath of the optic nerve
in case of present edema or hematoma, must be questioned [309].
If the course of the optic nerve is beyond the sphenoid
sinus or if the roof of its canal is fractured, the neurosurgical temporal approach is chosen. After detaching the
temporalis muscle, a circumscribed trephination is performed (pterional). After lifting of the dura, the nerve can
be exposed in its whole extraorbital course. Even this
access is characterized by a relative low trauma and
rapid recovery of the patient. Mastication may be impaired
[310].
The transorbital approach had been described even before the transethmoid access but it is no longer widespread. Current publications on transorbital surgery of
the anterior skull base could establish a new approach
to the tip of the orbit [311].
In the Cochrane review on the topic of surgical therapy
of TON, the author concludes, in analogy to the investigation of steroid therapy, that there is no convincing evidence in literature on the effectiveness of decompression
surgery [276]. In contrast to that, case reports give evidence that the decompression of the optic nerve led to
recovery of vision in several cases [275].
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4.6.7 Outcome, case reports
The available data result in one simple statement: there
are no evidence-based significant differences between
the therapeutic options [262]. Thus on the basis of the
current medical research no clear therapeutic recommendation can be given. Methodology as defined by means
of evidence based medicine seems to fail in terms of acquisition of new insights to the topic [276].
The most important paper on traumatic optic neuropathy
(Levin LA: The treatment of traumatic optic neuropathy:
The International Optic Nerve Trauma Study) had been
planned as international randomized 2-arm therapy study.
Two years after its beginning, the project had to be
abandoned because there were not enough patients who
could be included based on the required criteria. It was
continued as observational study and provides the most
systematical results. The most important ones are:
• The initial vision is a strong predictor for outcome. This
statement is confirmed by several other authors [257],
[267], [286], [312].
• There is no proven advantage of the application of
mega-dose therapy with methylprednisolone equivalents of more than 5,400 mg in comparison to low
doses.
• Onset of therapy is not of upmost relevance.
• The findings of CT diagnostic do not allow any conclusion on vision acuity on the long run.
• Neither steroids nor decompression surgery is better
than wait-and-see in an unselected patient group.
In the data analysis, some limitations of the results are
described. So in the group of operated patients a higher
number of severe cases were found. Steroid therapy was
started earlier than taking a decision for surgery. A serious
bias is given as only patients underwent surgery who
failed conservative therapy (wait-and-see or steroids).
Therefore patients with poor prognosis were selected for
the surgery. Possibly canal fractures that more frequently
lead to surgical indication are another bias because they
seem to be associated with a poorer outcome than cases
without fracture.
Based on the present case reports, it is not possible to
define clear inclusion criteria, the preconditions of therapy
are rarely comparable, and also the endpoints of the
studies are regularly not well defined. The most difficult
aspect of any study design is to assess the initial vision
of the patient immediately after trauma as the most important prognostic criterion. All authors agree that the
inclusion of patients with unclear vision leads to a bias
of the results, independent from therapy [262], [283],
[313]. Another important aspect is the beginning of
therapy. The earlier therapy starts, either conservative or
surgical, the higher is the chance to address patients,
who would have experienced spontaneous remission
anyway.
Animal experimental studies on rats with standardized
trauma of the optic nerve are only transferable to humans
in limited extent. However, they help understanding gen-
eral mechanisms of pathophysiology. In one publication
[314] no difference was found between the various
prednisolone regimes and controls regarding the axon
loss. Another paper revealed a significant dose-related
decrease of the number of axons with increasing steroid
dose [295].
4.6.8 Summary
High-dose and mega-dose therapy should be abandoned
in the treatment of TON. If lesser dosages have a positive
effect, is unclear. The results are inconsistent [255]. In
an animal experiment, a neurotoxic effect of corticosteroids was revealed in TON.
There are patients who benefit from surgical decompression. In this context it is unclear how to select them prior
to surgery. A possible group would be those patients with
hematoma within the optic nerve sheath and reduced
vision. Anyhow, the surgical decompression is only recommended in patients with delayed visual loss or in those
who do not experience improvement of vision after 4
days. A precondition in any case is a remaining visual
acuity. General recommendations for surgery do not exist.
5 Lateral midface
5.1 Fractures of the zygomatic bone
5.1.1 Epidemiology, pathogenesis,
classification
Fractures of the zygomatic bone complex are rather frequent because of the prominence of the zygomatic bone
[111]. Beside isolated fractures of the zygomatic arch,
they belong to the typical lateral fractures of the midface
resulting from direct trauma to the zygoma. Among the
most important origins of trauma, violence and traffic or
sports accidents must be mentioned [38]. Depending on
the direction of the impact vector, rotation and/or caudal
and dorsal dislocation of the zygomatic bone results [18].
The dislocation of the zygoma occurs in direction of the
impact and then secondarily due to traction of the masseter muscle [17]. In cases of isolated zygomatic bone
fractures, the fracture line extends through the zygomatico-frontal suture along the lateral orbital rim and
from there in caudal direction along the lateral and anterior orbital floor to the infraorbital edge. From the infraorbital edge the fracture line passed through the anterior
wall of the maxillary sinus and in general through the infraorbital foramen to the zygomatico-alveolar crest. From
there, the fracture line reaches the inferior orbital fissure
cranial to the lateral and posterior wall of the maxillary
sinus. The greater wing of sphenoid at the zygomaticosphenoid suture is involved as well [13] as the zygomatic
arch. The orbital floor is nearly always affected in cases
of fracture of the zygomatic bone. After an impact of high
violence, also a comminuted fracture of the zygomatic
complex may result and parts of the zygomatic bone may
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Table 6: Possible clinical symptoms in cases of fractures of the zygomatic bone complex
dislocate into the maxillary sinus. Concomitant injuries
of the zygomatic complex often affect the ocular globe
and optic nerve [315].
In literature, several classifications for fractures of the
zygomatic bone complex are found that could not be established for regular clinical application [14], [20], [316].
Differentiation of dislocated and not dislocated fractures
seem clinically useful [54].
5.1.2 Clinical symptoms
In order to correctly diagnose a fracture of the zygomatic
complex, a careful examination of the patient has to be
performed together with an assessment of history of the
accident [54]. Possible clinical symptoms of zygomatic
bone fractures are listed in the following table (Table 6).
The symptoms depend largely on the pattern and the
extent of the fracture of the zygomatic complex [233].
The patient should be informed as soon as possible that
he must not blow his nose because it may lead to emphysema due to laceration of the mucosa of the maxillary
sinus and increased pressure in the paranasal sinuses
[134]. The emphysema can extend via the neck into the
mediastinum [185], [215], [317]. The emphysema is
clinically relevant especially because of the massive
swelling of the soft tissue that makes initial examination
of the eye difficult and leads to delayed surgery. Usually
it is completely absorbed during the first postoperative
days though.
It may be of highest clinical relevance to early detect
neurological and ophthalmological complications that
require immediate surgical intervention [233]. The zygomatic complex is involved in the bony structures of the
orbital floor, the infraorbital rim, and the lateral orbital
funnel. Hence, each zygomatic bone fracture may damage
the eye. So it is essential to perform primary careful examination of vision [154], [230], [318]. The spectrum of
lesions of the eyes reaches from injury of the globe and
the eye muscles to lesions of the optic nerve with associated blindness [101], [145].
5.1.3 Radiological diagnostics
Conventional imaging of the paranasal sinuses and axial
imaging of the used to be applied for radiological assessment of zygomatic bone fractures [156]. In intubated and
polytrauma patients, however, this kind of radiological
imaging cannot be performed. It is of little value, particularly the orbital floor is not represented well enough. This
is why conventional imaging has lost its importance during
the last years. It is only applied for overviews after zygomatic bone fractures or for controls after osteosynthesis
and removal of materials [156]. As radiological standard
procedure CT scan is meanwhile established for diagnostics of the midface and also fractures of the zygomatic bone complex [156], [233], [319]. With a CT examination, bony structures as well as other sequels of injury
such as foreign body, hematoma, herniation, and emphysema can be well depicted. Injuries of the zygomatic
complex can be assessed in axial, coronal, and sagittal
levels. For very complex trauma, also a 3-dimensional
reconstruction on the basis of DICOM datasets can be
performed and thus facilitate the evaluation of the injuries. If the CT datasets are implemented in surgical planning software, navigated surgical control or the creation
of individual grafts for reconstruction of the orbital walls
can be performed [13], [24], [75].
Modern software allows the virtual planning of surgery
with segmentation of the affected regions, mirroring of
skeletal parts in comparison to intact bony structures as
well as fusion of different data sources beside the 3-dimensional presentation of the current situation [13].
Generally, also cone beam tomography (CBT) may be
appropriate for the 3-dimensional presentation of zygomatic bone fractures. The disadvantage of this procedure
is the low significance regarding soft tissue structures.
In this regard, CT diagnostic is superior. Also the globe
as well as other relevant structures of the orbit (e.g. eye
muscles, optic nerve, retroglobal hematoma) can be well
assessed with computed tomography [156]. In case of
orbital involvement with disturbed eye movement, en- or
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exophthalmos, reduced vision as well as retrobulbar
pains, CT scan is indicated [156].
5.1.4 Surgical indications
In case of non-dislocated zygomatic bone fractures
without functional disorders, there is generally no need
for surgical therapy. Functional disturbances in the context of fractures of the zygomatic complex concern the
eye, the infraorbital nerve, and the opening of the mouth
[233]. Frequently, fractures of the zygomatic complex
lead to impairment of the infraorbital nerve which can be
temporary or also permanent. The nerve can be damaged
directly because of the trauma or by pinching in its bony
canal when the fracture passes through the infraorbital
foramen and if fragments are dislocated. Sensitivity disorders in the area of the infraorbital nerve itself do not
indicate surgery. In case of non-dislocated fractures of
the zygomatic bone after direct violent trauma, there is
explicitly no indication for surgery because the exposition
of the fracture could lead to further damage of the nerve
[105], [106]. In case of suspected pinching of the infraorbital nerve caused by dislocated bone fragments, there
is an indication for surgery, however, also closed reposition of the zygomatic bone complex may be possible [18],
[54].
The involvement of the zygomatic arch and according
dislocation in medial direction can lead to an impairment
of the coronoid process of the mandible and thus to impaired opening of the mouth. In those cases, a clear indication for open or closed reposition of the fractures is
given [233].
5.1.5 Therapy
The extent of damaged bones and the degree of dislocation determine where the fracture is exposed. By means
of osteosynthesis the repositioned fragments are stabilized in order to permanently achieve an exact anatomically correct position of the zygomatic bone [13]. Generally,
the objective is to perform reposition and osteosynthesis
in the simplest way via limited transfacial or transconjunctival approaches [13]. For osteosynthesis, usually
mini- and microplate systems are applied that are positioned over the fracture lines and tightened by screws.
They are sufficiently robust to keep the fragments in the
correct position. Often, a so-called 3-point fixation (“tripoid”) of the zygomatic bone over the zygomatico-frontal
suture, the infraorbital rim and the zygomatico-alveolar
crest is performed [13] (Figure 12). After reposition and
stabilization of the body of the zygoma accompanying
fractures of the orbital floor or orbital wall are addressed
(see also chapter on fractures of the orbital floor).
Another order of the surgical procedure can be necessary
in emergency situations when loss of vision is immanent,
in case of retroglobal hematoma or in infantile trap-door
fractures with impaired eye movement [142], [156],
[320].
For therapy of fractures in the area of the zygomatic
complex, numerous procedures are at disposition that
will be discussed in the following.
Figure 12: Tripoid fixation of a zygomatic bone fracture in
combination with a titanium mesh for stabilization of the
fracture of the orbital floor
5.1.5.1 Conservative treatment
In cases of non-dislocated or minimally dislocated fractures of the zygomatic bone, the indication for conservative procedure is made. Those are physical measures
(cooling ect.) and drug therapy (analgesics, decongestion).
Furthermore the patient is instructed to eat soft meals
only to avoid secondary dislocation of the zygoma as a
result of traction of the masseter muscle. In patients with
severely impaired operability, conservative treatment may
be indicated despite dislocation of the zygomatic bone
[120]. On the other hand, orbital complications even
without dislocation of the zygomatic bone complex can
be an indication for emergency surgery.
5.1.5.2 Surgical therapy
Surgical therapy is generally applied in all dislocated, instable, and comminuted fractures of the zygomatic bone.
For closed reposition, the zygomatic bone is repositioned
without exposure of the fracture gaps via a bone hook
that is inserted percutaneously below the zygomatic bone.
It is expected that the reposition remains stable even
without osteosynthesis [205]. In cases of open reposition,
the repositioned fragments are stably fixed with up to
date osteosynthetic plates and screws in the anatomically
correct position.
5.1.5.3 Closed reposition
The exact reposition of the body of the zygomatic bone
is the decisive step of fracture treatment in every dislocated fracture of the zygoma. In some cases the achieved
result remains stable also without osteosynthesis so that
exposition of the fracture lines can be sidestepped. Especially suitable are fractures where the zygomatic bone is
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broken as complete fragment and dislocated. Furthermore the fracture should be repositioned as early as
possible. The two biggest problems are the missing control of fracture gaps and thus of the outcome of repositioning and the uncertainty of the postoperative stability
of the repositioned zygomatic body [54]. Contraindications
for closed reposition are complex or comminuted fractures
of the zygomatic complex as well as doubts of the surgeon
regarding the stability of the reposition. Furthermore,
closed treatment of zygomatic fractures is automatically
contraindicated if surgical revision of the orbital floor is
necessary [54]. Advantages of closed reposition are:
Minimally surgical effort, effective reconstruction of the
zygomatic position and decompression of the infraorbital
nerve. Sometimes not even general anesthesia is necessary for closed reposition of the zygomatic bone.
For closed reposition of the zygomatic bone, 2 transcutaneous approaches are recommended. The approach
according to Gillies consists of reaching the zygomatic
bone via a small temporal incision performed with the
elevator [233]. It is important to incise the fascia of the
temporalis muscle in order to insert the elevator directly
below the zygomatic arch and bone. The second possibility
is performed directly percutaneously with a bone hook.
After stitch incision (about 2 cm lateral and caudal of the
temporal canthus) the hook is inserted directly through
the skin under the zygomatic bone and the zygomatic
complex is repositioned [30]. The course of the zygomatic
arch may be palpated with the hook after reposition to
control the result. A less established technique of closed
zygomatic reposition is the direct percutaneous insertion
of the osteosynthetic screw or a “Caroll-Girard” screw into
the zygomatic bone in order to pull the zygomatic bone
out of the dislocated position and to reposition it [54]. A
disadvantage of this last-mentioned method is the risk
of damaged facial nerve [233].
5.1.5.4 Open reposition without reconstruction of the
orbital floor
The open reposition of the zygomatic complex is indicated
when a comminuted fracture is found, or when the fracture is instable. This may be the case if initial reposition
was performed with the bone hook, but then after release
of the hook the zygomatic bone sinks back into the dislocated position.
The objective of open reposition is the control of fracture
gaps in first place and thus the result. Second is reposition and stable osteosynthesis in order to secure the
result. In case of open repositioning, a decision needs to
be taken where to expose the fracture. In future, the
control of fracture repositioning may be facilitated by use
of 3D image converter technique in more places [13].
Location and number of exposed fracture sites depends
on the experience of the surgeon amongst others [54].
On the other hand, the more complex a fracture is, the
more regions have to be exposed and treated with osteosynthesis [233]. The complexity of a fracture does not
only depend on the fracture morphology and the course
of the fracture lines but also from the surgical access,
the sight and accessibility of the fractured region and the
stability of the fragments. Furthermore, the biomechanical
needs of the individual fracture determine the number,
position, and thickness of the osteosynthetic plates [54].
A reliable approach to adequate repositioning of a dislocated zygomatic bone is found at the transition zone of
the greater wing of sphenoid to the zygomatic bone in
the area of the lateral wall of the orbit [20], [318], [321].
Further areas of control for reposition of the zygomatic
bone are the zygomatico-alveolar crest and the infraorbital
rim. In contrast, the area of the zygomatico-frontal suture
is considered as not being reliable for the visual evaluation of an exact repositioning of the zygomatic bone
[20], [233], [318]. Repositioning of a fractured zygomatic
arch in the context of zygomatic fractures does normally
not require exposition under direct visual control.
Osteosynthesis of zygomatic bone fractures is classified
in 1-point, 2-point, 3-point, and 4-point fixation. A detailed
description of the procedure is provided in the “AO Surgery Reference” guide of the AO foundation [54]:
1-point exposition and fixation
Not comminuted, simple fractures of the zygomatic
complex may be sufficiently fixed with only one miniplate
as long as repositioning is easy. The preferred access is
via an intraoral approach with good overview and control
of the zygomatico-alveolar crest and the infraorbital rim.
Indications for this approach are missing separation of
the zygomatico-frontal suture and intact orbital floor. The
1-point fixation is controversially discussed in the area
of the zygomatico-frontal suture. From a biomechanical
point of view, a fixation seems to be reasonable because
it gives resistance to the traction forces of the masseter
muscle. On the other hand, the internal aspect of the
lateral orbit (zygomatico-sphenoid suture) must be exposed for good control of the result.
2-point exposition and fixation
Beside visualization of the zygomatico-alveolar crest, the
exposition of the lateral orbital rim together with the zygomatico-sphenoid suture is useful. The exposition of those
two points allows a good control of the correct 3-dimensional reposition of the zygomatic bone as well as a stable
osteosynthetic fixation [233]. Alternatively to the lateral
orbital rim, the infraorbital rim can be exposed as second
point and stabilized by means of a plate.
3-point exposition and fixation
For 3-point fixation, the lateral orbital rim, the infraorbital
edge, and the zygomatico-alveolar crest are exposed and
stabilized by means of osteosynthesis. The exposition of
3 points allows a reliable control of the 3-dimensional
position of the zygomatic bone and at the same time a
stable fixation of osteosynthesis of all 3 fractured areas
[321]. Besides a good control of the zygomatic bone,
treatment of a fracture of the orbital floor may be an indication of 3-point exposition (Figure 12).
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4-point exposition and fixation
In the context of 4-point exposition and fixation, the zygomatic arch is exposed in addition to the three abovementioned areas and if necessary it is stabilized with
osteosynthesis. This procedure is indicated only rarely in
cases of isolated lateral fractures of the midface and is
rather applied in pan-facial fractures with comminution
of the zygomatic bone and arch and loss of facial projection. Generally a coronal access (coronal incision) with
its advantages and disadvantages is necessary for exposition of the zygomatic arch.
5.1.5.5 Open reposition with reconstruction of the orbital
floor
In many fractures of the zygomatic bone complex, the
orbital floor is affected as well and requires surgical revision and reconstruction. Reconstruction of the orbital
floor is always indicated if imaging reveals a large defect
or herniation of the periorbital fatty tissue into the maxillary sinus. Additional reasons are a severe fragmentation
and dislocation of the orbital floor, sometimes with
impairment or pinching of the eye muscles.
Reconstruction of the orbital floor can explicitly not be
indicated if the eye is severely damaged by trauma or
previous surgery and if any additional manipulation in
the area of the orbit increases the risk for the affected
eye.
In cases of open reposition and reconstruction of the orbital floor, at least 2-point exposition and fixation is applied. For complex fractures with significant dislocation
and simultaneous fragmentation, the 3 point exposition
and fixation is the general rule.
5.1.5.6 Surgical approaches for open treatment of
fractures of the zygomatic complex
Approaches via traumatic skin lesions
Trauma in the area of the midface is often associated
with soft tissue lesions. These can be used as access for
fracture repositioning and osteosynthesis if they are located and sized appropriately. If their position is favorable
but too small for exposition of the fracture, they may be
extended via incisions parallel to the natural skin lines
[54].
Transoral approaches to the zygomatic bone
In many cases the caudal zygomatic bone pillar with the
zygomatico-alveolar crest is the region of first choice for
exposition and osteosynthesis of a fracture [127], [150],
[318]. After repositioning of the fracture, mostly a 2.0
mm L miniplate is sufficient to stabilize the zygomatic
bone [233].
The transoral exposition of the zygomatic bone is either
performed via a vestibular approach in the area of the
maxilla or via midfacial degloving. The latter approach
can be used for exposition of the whole maxilla as well
as the nose and ethmoid region but is only rarely applied
for treatment of midfacial fractures [54].
By a vestibular approach the maxilla can be exposed from
the piriform aperture to the region behind the zygomaticoalveolar crest and cranially to the infraorbital rim [54].
For a better exposition of the zygomatic prominence, the
primary horizontal incision can pass at the dorsal edge
in cranial direction [54]. Especially in cases of bilateral
exposition of the maxilla, sutures must counteract the
contraction of the nasolabial muscles that had been detached from the periost. For this purpose, sutures are
used that fix the bases of the nasal wings and join them
medially (so-called cinching suture) and connect the
mucosal edges in the midline in V-Y technique. A very
good description of the surgical procedure for transoral
approaches is provided by the AO Surgery Reference [54].
Transcutaneous approaches to the supero-lateral orbital
rim
Osteosynthesis of the zygomatic complex in the area of
the supero-lateral orbital rim is traditionally considered
to be one of the main fixed points of a fractured zygomatic
bone. Even for biomechanical reasons, a miniplate fixed
there can optimally react on the muscular traction of the
masseter muscle and thus avoid postoperative dislocation
of the zygomatic bone [20], [30], [233]. Possible approaches are the lateral access at the eyebrow and the
access through the upper eyelid (superior blepharoplasty
approach).
The lateral access through the eyebrow is simple and can
be rapidly performed. It allows direct sight to the zygomatico-frontal suture. The view on the inside of the lateral
orbital wall, however, is very limited. Therefore control of
the correct repositioning of the zygomatic bone at the
transition to the sphenoid (zygomatico-sphenoid suture)
is difficult [54]. In contrast, the superior blepharoplasty
approach provides a significantly better overview of the
whole lateral orbit and at the same time the scars remain
minimal [54], [113]. A very detailed description of the
surgical procedure for both approaches is found in the
AO Surgery Reference [54].
Accesses to the infraorbital rim
The infraorbital rim is considered as an uncomfortable
area for osteosynthetic fixation of an instable fracture of
the zygomatic complex [164], [233]. Nonetheless, exposition of the fracture in this area is often necessary to
reestablish the contour of the infraorbital rim. Generally
transcutaneous or transconjunctival approaches are
possible. The spectrum and the according advantages
and disadvantages are described in the following.
Transcutaneous access through the lower eyelid
In this context, subciliary incisions (inferior blepharoplasty
incision), subtarsal incisions, and infraorbital incisions
are classified [54], [124], [322] (Figure 13). The subciliary
incision is placed about 2 mm below the grey line of the
lower lid. The subtarsal incision is performed in a natural
skin line of the lower eyelid in the middle of the lower
eyelid below the tarsus. In both incision, primarily only
the skin is incised and the fibers of the orbicularis oculi
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Kühnel et al.: Trauma of the midface
muscle are not touched. The transection of the muscle
is performed generally 3–5 mm below the skin incision.
For subtarsal incision, the muscle can be transected at
the same level or also some millimeters further caudal.
The advantage of transection of the orbicularis oculi
muscle on the same level is the better blood supply of
the caudal wound edge because muscle and skin are not
separated. The infraorbital approach directly over the infraorbital rim is generally considered as being critical
[233]. The possible adverse effects are postoperative
edema in the area of the lower eyelid and the unfavorable
scar formation [54], [233]. The AO Surgery Reference for
that reason does not specify the surgical procedure of
the infraorbital approach. Generally transcutaneous approaches through the lower eyelid lead to scarring even
if subciliary and subtarsal incisions are not eye-catching.
Another disadvantage of transcutaneous approaches
through the lower eyelid is the risk of lower eyelid ectropion [318], [322].
orbital rim is more direct whereas the preseptal preparation avoids a prolapse of the orbital fatty tissue [323].
With the transconjunctival approach through the inferior
fornix, the infraorbital rim, the orbital floor, and the superior edge of the maxilla can be exposed. Via a pre- or
transcaruncular incision, additionally the medial orbital
wall can be exposed. In many cases, lateral canthotomy
is necessary for better overview of the lateral orbital wall.
With this extension of the approach, even the area of the
zygomatico-frontal suture can be reached. Generally, all
transconjunctival approaches bear the risk of entropion
development [322]. A subtle surgical technique and accurate wound closure help avoiding those complications.
Generally cornea protection has to be used for transconjunctival approaches.
Figure 14: Classical transconjunctival approaches with preand postseptal dissection
Figure 13: Transcutaneous approaches by the lower eyelid (A:
subciliary incisin; B: incision in the middle of the lower eyelid;
C: infraorbital incision)
Transconjunctival approaches
The transconjunctival approaches were developed to
avoid visible scars. Currently they are described as approaches of first choice in the literature for many cases
of necessary exposition of the infraorbital rim or the orbital floor [233]. The difference is made between the classical transconjunctival approach (inferior fornix), the
transcaruncular approach (medial transconjunctival), the
transconjunctival approach with lateral skin extension
and lateral canthotomy (swinging eyelid), the combination
of transconjunctival and transcaruncular or the combination of transcaruncular and transconjunctival approach
with lateral canthotomy (C-shaped incision) [54]. Beside
the invisible scars, the advantage of these procedures is
the possibility to extend and to combine the approaches.
In terms of the classical transconjunctival preparation,
the difference between pre- and postseptal preparation
is important (Figure 14). The postseptal approach to the
Coronal approach (coronal incision)
If an open exposition of the zygomatic arch is needed,
the direct transcutaneous approach is not recommended.
The risk of damage of the frontal branch of the facial
nerve is extremely high. Instead, a coronal access is used
to expose the zygomatic region. In traumatology of the
midface and the fronto-orbital region, the coronal approach is universally applicable. It allows exposing the
complete calvaria, the anterior and lateral skull base, the
region of the frontal and ethmoid sinuses, the lateral aspect of the zygomatic bone, the zygomatic arch, the superior part of the orbit, the nasal bones, the area of the
mandibular joint, and the processes of the mandibular
joint. The transection of the skin and the subcutaneous
tissue is performed behind the hairline to avoid visible
scars. For bald men, the coronal incision can be placed
in the area of the back of the head. The frontal branch
of the facial nerve is protected by dissecting the tissue
below the superior layer of temporal fascia [324]. For
exposition of the zygomatic arch, the incision has to be
extended in caudal direction, either in pre- or postauricu-
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Kühnel et al.: Trauma of the midface
lar direction. A detailed description of the surgical procedure of performance of coronal incisions is found in the
AO Surgery Reference [54] and in a publication of Ellis
and Zide [323].
For isolated exposition of the zygomatic arch, also a unilateral coronal incision can be performed. It allows a good
overview and leads to acceptable esthetic results [87],
[157].
5.2 Isolated zygomatic arch fractures
Fractures of the zygomatic arch that are associated with
fractures of the zygomatic complex are treated in the
context of repositioning and fixation of the zygomatic
bone [13], [54]. Isolated fractures of the zygomatic bone
have different appearances. M- or V-shaped impression.
Fractures are typical due to direct trauma to the zygomatic
arch. Due to the dislocation of the bony fragments in
medial direction, the mobility of the muscular process of
the mandible can be impaired. The clear sinking in the
area of the zygomatic arch prominence and an impaired
opening of the mouth are obvious. If an isolated fracture
of the zygomatic arch is suspected, an axial imaging of
the skull is helpful. The zygomatic arch is freely projected
so that the assessment is facilitated [156].
The major part of dislocated isolated fractures of the zygomatic arch can be repositioned by transcutaneous
closed procedure with the bone hook [163]. Especially
in case of M- or V-shaped fractures of the zygomatic arch,
a “clicking into place” of the fragments can be heard
[160]. Generally those fragments remain stable without
further fixation. For the closed repositioning, also a
transoral (according to Keen) or a temporal procedure
(according to Gillies) can be chosen [54]. If the repositioned zygomatic arch is likely to sink back into the dislocated position, an attempt is possible to stabilize the zygomatic arch in its position by means of an external splint
to which the zygomatic fragments are fixed with deep
sutures [159], [233]. An external splint that is fixed of
the repositioned zygomatic arch also protects the fracture
area [54]. It is helpful to assess the result of repositioning
to perform intraoperative radiological 3D controls [325].
More complex and very instable fractures of the zygomatic
arch may require an open exposition of the fracture and
osteosynthesis. In this context, a preauricular approach,
probably with use of an endoscope, or a coronal incision
are chosen [54], [326].
concept must be established in order to reconstruct the
facial skull in its correct height, width, and projection.
The origin of pan-facial fractures is mostly high-energy
trauma that consist of a primary force to the face and
additionally of secondary or contrecoup forces leading to
relevant injuries. According to the current literature, about
4–10% of all fractures of the facial skull are pan-facial
fractures. They are mainly caused by traffic accidents or
gunshots [327]. In 80% of pan-facial fractures, fractures
of the joint head or the articular process of the mandible
are concerned beside the midfacial fractures. Often even
the dental arch of the maxilla and the mandible are affected and thus reconstruction of the occlusion and the
original width of the face is particularly difficult. A sagittal
fracture of the maxilla and a so-called open-book fracture
of the mandibular arch with bilateral fractures of the articular processes in combination with paramedian and
median fractures of the mandible lead to a loss of the
transversal dimension [76].
The structure of the facial skull is characterized by the
course of the vertical and horizontal trajectories
(Figure 1). The accurate reconstruction of those bone
pillars is crucial for the treatment of pan-facial fractures.
The following parameters must be observed [327]:
• Preservation of the projection and protection of the
airways
• Preservation of the anchorage of the musculoaponeurotical system
• Protection of important structures and functions:
• Frontal brain
• Eyes and vision
• Neurovascular entrances
• Oropharyngeal mechanisms for speaking, chewing,
and swallowing
• Reconstruction of the original height, width, and projection of the facial skull
• Reconstruction of the following vertical trajectories:
naso-maxillary, zygomatico-maxillary, auricular process,
and ascending branch of the mandible
• The pterygo-maxillary pillar is usually not reconstructed because of the poor accessibility.
• Reconstruction of the following horizontal trajectories:
frontal, zygomatic bone, maxillary, mandibular
• The surgeon has to bear in mind that the horizontal
trajectories of the central midface are physiologically
relatively weak and after fracture there is the risk of
losing the projection.
6 Pan-facial fractures
The following principles of reconstruction are further recommended [327]:
Pan-facial fractures concern the superior, middle, and
inferior third of the facial skull [327]. They are a challenge
for the responsible team because often important reference points for reconstruction of the facial skull are
missing and at the same time a multitude of difficult
concomitant findings such as massive comminution, loss
of tissue, and intensive bleedings are found. So for every
patient with pan-facial trauma an individual treatment
• Prioritization of the functional preservation of brain,
eyes, and hearing
• Stabilization of open mandibular fractures as soon as
possible
• Support of the pillar structures of the midface (splints,
support) until definitive treatment can be performed
• Preservation of the integrity of soft tissue and subunits
of the face
• Neurovascular structures and tracts
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Kühnel et al.: Trauma of the midface
• Cranial nerves
• Lacrimal ducts
• Careful planning of fracture treatment (course)
• Planning of probably necessary bone transplantation
• Final reconstruction of soft tissue
For the definite procedure of surgical treatment of fractures there are several possibilities. For many pan-facial
fractures the primary reconstruction of the occlusion
turned out to be useful. In the context of this bottom-up
procedure, first both dental arches are reconstructed in
their original width and toothing and from there in upward
direction the fractures midfacial structures are reconstructed. Patients with pan-facial fractures with simultaneous
fracture of the mandibular symphysis (and preserved
dentition) it may be appropriate to first treat the fracture
of the symphysis in order to re-establish the width of the
dental arch. On this basis, the comminuted and sometimes extended arch of the maxilla can be reconstructed
in the Le Fort level and stabilized with osteosynthetic
plates or via mandibular-maxillary fixation [328].
In the context of the top-down procedure the stable frontoorbital frame is taken as reference for the reconstruction
of the midface in caudal direction. The advantage is that
in case of fractures of the auricular processes the risk is
lower to fix them in an incorrect position. Generally, it is
not appropriate to stick dogmatically to one strategy. The
experienced surgeon uses the existing stable bony elements as references and from there he approaches,
sometimes from different sides, the comminuted or defect
areas.
A typical surgical procedure for pan-facial fractures could
be:
• Reconstruction of the frontal and supraorbital frame
(via coronal incision)
• Reconstruction of the lateral orbital structures, the
zygomatic bones and arches
• Assembling of the sagittally fractured maxilla and establishing the occlusion (MMF), if necessary the
mandibular factures are treated previously
• Reconstruction of the other frame and wall structures
of the orbits
• Reconstruction of the zygomatico-alveolar crest (if
needed with bone transplantations)
• Reconstruction of the nasal projection
In summary, the treatment of pan-facial fractures of the
facial skull still represents an major challenge and often
requires an interdisciplinary strategy. The primary objective is the accurate reconstruction of the cranio-facial
structures in all three dimensions and preservation of all
relevant functions in this area (brain, vision, hearing,
swallowing, chewing, smelling, mimic, and esthetic).
Notes
Competing interests
The authors declare that they have no competing interests.
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Corresponding author:
Prof. Dr. Thomas S. Kühnel
Department of Otolaryngology, Head & Neck Surgery,
University of Regensburg, Franz-Josef-Strauss-Allee 11,
93053 Regensburg, Germany
thomas.kuehnel@ukr.de
Please cite as
Kühnel TS, Reichert TE. Trauma of the midface. GMS Curr Top
Otorhinolaryngol Head Neck Surg. 2015;14:Doc06.
DOI: 10.3205/cto000121, URN: urn:nbn:de:0183-cto0001210
This article is freely available from
http://www.egms.de/en/journals/cto/2015-14/cto000121.shtml
Published: 2015-12-22
Copyright
©2015 Kühnel et al. This is an Open Access article distributed under
the terms of the Creative Commons Attribution 4.0 License. See license
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