Pelvic girdle, Femur, Sacroiliac joint and Hip Joint
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The document discusses the anatomy of the pelvic girdle and femur. It describes the bones that make up the pelvic girdle - the hip bones, pubic symphysis and sacrum. It then details the individual bones, their features and articulations. This includes the sacroiliac joint and hip joint. It also outlines the ligaments supporting these joints and the movements they allow. Finally, it lists some of the muscles involved in hip joint movement.
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Pelvic girdle, Femur, Sacroiliac joint and Hip Joint
2. OBJECTIVES
Explain the bony structure of pelvic girdle and femur
Explain the associated joints of pelvic girdle and
femur
Explain about the muscles of pectoral girdle and
femur.
3. Hip girdle
Consists of :
2 hip bones
Pubic
symphysis
Sacrum
PELVIC GIRDLE
4. Known as coxal bones
Unite anteriorly at pubic symphysis
Unite posteriorly with the sacrum at the sacroiliac
joints
Pelvic / innominate / hip bones
5. Hip bone consists of 3
bones separated by
cartilage in newborn :
- ilium : superior
- pubis : inferior &
anterior
- ischium : inferior &
posterior
Pelvic / innominate / hip bones
6. Largest of the 3
components of hip bone.
Divided into:
1. Superior ala ( = wing)
2. Inferior body – form
acetabulum
Ala
8. Superior border – iliac crest
Ends anteriorly in a blunt - anterior superior iliacanterior superior iliac
spine (ASIS)spine (ASIS)
Below ASIS – anterior inferior iliac spine (AIIS)
Ends posteriorly in a sharp: posterior superior iliac
spine (PSIS)
Below PSIS – posterior inferior iliac spine (PIIS)
The spines - as a points of the attachment for the
tendons of the muscles of the trunk, hip and thighs.
Below the PIIS - greater sciatic notch which allow the
passage of the sciatic nerve
10. Conspicuous marking lateral surface of ilium are 3 arched
lines :
Posterior, anterior and inferior gluteal line
The gluteal muscles attach to the ilium between these lines.
Medial surface of ilium:
iliac fossa – a concave surface; attachment site for iliacus
muscle.
Posterior to iliac fossa
iliac tuberosity – attachment site for sacroilliac
ligament.
auricular surface - which articulates with the sacrum
to form the sacroilliac joint.
Projecting anteriorly and inferiorly from the auricular surface -
arcuate line.
11. Inferior & posterior
portion of the hip bone
Divided into :
Superior body
Inferior ramus
13. The apex of the angulation is blunt and rounded, forming
ischial tuberosity.
In the sitting position, the weight of the body rest on the
two ischial tuberosity.
Anteriorly the tuberosity passes upward as the ischial
ramus continuous with inferior pubic ramus, forming
ischiopubic ramus.
The body of ischium forming 2-fifth of the acetabulum.
Posterior border of the body is continuous above to form
greater sciatic notch.
Inferiorly this border end as a blunt medially projecting
called ischial spine, below which is the groove forming the
lesser sciatic notch.
14. Anterior & inferior part
of the hip bone
Divided into:
Superior ramus
Inferior ramus
Body (between
the rami)
15. Anterior border of the body - pubic crest
Lateral end – a projection called the pubic tubercle
Together ramus of ischium and ramus of pubis
surround the obturator foramen
Pubic symphysis:
Joint between the two pubic bones
Consist of disc of fibrocartilage
Ampiarthroses
18. Is a deep fossa formed by ilium, ischium and pubis
The anterior 1/5th
of the acetabulum is formed by the
pubis, the posterosuperior 2/5th
by the body of ilium and
the posteroinferior 2/5th
by the body of ischium.
Function – as the socket that accept head of the femur
Together the acetabulum and head of femur form
hip (coxal) joint / acetabulofemoral joint.
Inferior side of the acetabulum - acetabular notch, is a
deep indentation, forms a foramen through which
blood vessels & nerves pass
19. Functions of the Pelvic Girdle
1. Supports and protects the pelvis viscera (as well lower
abdominal) ---- true pelvis and false pelvis
2. Supports the body weight transmitted through vertebra,
hence through sacrum, across the sacroilliac jt to the
innominate bones and then to the femur in standing
position or to the ischial tuberosity when sitting.
3. During walking the pelvis swings from side to side by a
rotatory movement at the lumbosacral jt, enables a patient
to walk reasonably well
20. 4. Provide muscles attachments
5. In the female it provides bony support for the birth
canal
6. Accepts the bones of the lower limbs, connecting them
to the axial skeleton
Functions of the Pelvic Girdle
22. FEMUR
Thigh bone
Is the longest, heaviest, strongest bone
Proximal end articulates with the acetabulum of the
hip bone
Distal end articulates with tibia and patella
Body (shaft) closer to midline
The angle is greater in females - pelvis is broader
24. PROXIMAL END OF FEMUR
Rounded head which articulates
with the acetabulum of the hip
bone to form the hip (coxal)
joint
The head contains fovea capitis -
a small centered depression.
Ligament of the head of femur
(ligamentum teres) connects the
fovea capitis of femur to the
acetabulum of the hip bone
The neck of femur is constricted
distal to the head
Neck connect the head into shaft
and have 125° angle. (Normal
26. Torsion Angle
The angle of torsion
between femoral
neck and femoral
shaft on the
transverse plane.
Femoral neck
normally project
upward about 15 °.
(normal anteversion)
27. Greater and lesser trochanter - projection from the
junction of the neck and shaft serves as points of
attachment for the tendons of some of the thigh and
buttock muscles
Greater trochanter – large quadrilateral process,
prominence felt and seen anterior to the hollow on the
intramuscular injection
Lesser trochanter – conical in shape, inferior and
medial to the greater trochanter
28. Between the anterior surface of the trochanters is a
narrow intertrochanteric line
Between the posterior surface of the trochanter is a
ridge called the intertrochanteric crest
Inferior to the intertrochanteric crest posteriorly on
the body of femur is a vertical ridge called gluteal
tuberosity
Gluteal tuberosity blends into another vertical ridge
called the linea aspera
Linea aspera serves as attachment points for the
tendons of several thigh muscle
29. DISTAL END OF FEMUR
• Expanded distal end of the femur includes the
medial condyle and the lateral condyle
• Superior to the condyle are medial epicondyle and
lateral epicondyle to which the ligament of the
knee joint attach
• The patella surface is located between the
condyles on the anterior surface
• Intercondylar fossa - depressed area between
condyles on the posterior surface
32. SACROILIAC JOINT
Articulation surface – auricular surface of ilium and
auricular surface of sacrum
It is a strong, weight bearing synovial joint with
irregular elevations and depressions articulating
surface that produce interlocking of the two bones
Strengthen anteriorly and posteriorly by strong
ligaments --- ant/post sacroiliac lig, sacrotuberous
lig , sacrospinous lig
At the same time strengthen by anterior (abdominal
muscles) posterior by gluteal muscles.
Less mobility, but more stability – resist high level of
forces of the pelvis during walking, running, jumping
etc.
33. Ligaments of the Sacroilliac Jt
SI jt is richly endowed with
ligaments.
Extreamly strong posterior
and slightly weaker anterior
ligaments surrounds the
capsule
And accessory ligaments
situated some distance from
the joint provide additional
stability against unwanted
movements.
34. Anterior Sacroilliac Ligament
Broad and flat
Lying anteriorly on the
pelvic side of the joint
It stretches from the ala
and pelvic brim to the
adjoining margin of the
auricular surface of the
illium.
35. Posterior Sacroiliac Ligaments
Lying posterior and superior of the joint
Much more thicker and stronger than anterior SI
Lig.
Several specific bands identified as they extend
from sacrum and the tuberosity of the ilium.
1. Interosseous Sacroiliac Lig.
2. Long and short posterior SI Lig
37. Interosseous SI Ligament
The deepest of all the
posterior SI Lig.
Short, thick and
extremely strong.
Fills the narrow cleft
between the rough
areas on the bones
immediately behind
and above the
auricular surface.
38. Short and Long Posterior SI Ligament
Superficial to the Interosseous SI Lig
Consist of numerous bands passing between two bones
Passing horizontally on the upper part between the two
bones – short band
Passing obliquely downwards and medially between 2
bones – long band
Short Posterior SI Lig – resist anterior movement
anterior movement of sacral promontory
Long Posterior SI Lig – resist downward movement of
the sacrum
40. Accessory Ligaments of SI Jt
The most accessory lig that provide stability to the
SI jt are:
1. Supraspinous lig
2. Sacrotuberous lig
Help stabilize the sacrum on the pelvic bone by
preventing from forward tilting of the sacral
promontory.
They also converting greater and lesser sciatic
notch into greater and lesser sciatic foramina.
41. Sacrotuberous Ligament
Flat, triangular, strong
Attached between PSIS
and PIIS, back and side of
the sacrum and coccyx
and continuously
attached to the ischial
tuberosity
42. Sacrospinous Ligament
Triangular band
Deep to the
sacrotuberous lig
Attached from the
lower edge of the
sacrum and coccyx,
continuously extends
and attached to the
ischial spine.
44. Movements of Sacroiliac Jt
Arrangement of the jt
surface and ligamentous
support given minimum
movement – low ROM
Slight gliding and
rotation between two
bones – forward tilting
and backward tilting.
46. HIP JOINT
Also known as coxal joint
The hip joint referred to as the acetabulofemoral joint
Multiaxial ball and socket joint
Articulation surface ---Head of femur and acetabulum
of hip bone
Its primary function is to ; 1. Stability -- support the
weight of the body in both static (e.g. standing) and 2.
Mobility --dynamic (e.g. walking or running) postures.
47. Movement of Hip joint
1. Flexion
2. Extension
3. Abduction
4. Adduction
5. Medial rotation of thigh
6. Lateral rotation of thigh
48. The Stability of the Hip Joint
The stability of the hip joint determined by
Shape of the articular surface
Strength of the articular capsule
Strength of the ligaments (extra and intracapsular)
Insertion muscles that crossing the joint
49. Articular Capsule
The fibrous capsule of the hip is very strong, thicker
anteriorly and superiorly
Proximally the capsule surrounds the acetabulum,
attaching directly outside the labrum
Distally attached anteriorly to the intertrochanteric
line and to the junction of the neck and trochanters.
51. Extracapsular Ligaments
There are three extracapsular ligaments that
stabilize and strengthen the hip joint
1. Iliofemoral ligament
2. Pubofemoral ligament
3. Ischiofemoral ligament
Prevent an excessive range of movement in the joint.
52. Iliofemoral Ligament
Y shaped - Very strong and
consider thickness
Situated anterior to the joint
Triangular band which apex
attaching to the lower part of
the AIIS and adjacent part of
the labrum
And the base attached to the
intertrochanteric line.
Prevent hyperextension of the
hip joint especially during
standing
53. Ischiofemoral Ligament
Spiral in shape
Arises from the body of the
ischium and attached to
the superior part of the
neck and greater trochanter
of the femur.
This ligament slackens
during adduction, tenses
during abduction &
strengthens the articular
capsule.
54. Pubofemoral Ligament
Runs from the iliopubic
eminence and superior
ramus of pubic and attached
to the intertrochanteric line
(blends with iliofemoral lig)
Prevents overabduction of
the femur at the hip joint &
strengthens the articular
capsule.
55. Role of the Extracapsular
Ligaments
During standing erection – all three lig are under
moderate tension
Hip flexion – all lig become relax
Hip extension – all lig become taut (greatest tension
from iliofemoral)
Hip adduction - iliofemoral (taut), pubo and
ischiofemoral (slackens)
Hip abduction – iliofemoral (slackens), pubo and
ischiofemoral (taut)
56. Cont..
Lateral rotation – iliofemoral and pubofemoral lig
(taut), ischiofemoral (slackens)
Medial rotation – iliofemoral and pubofemoral
(slackens), ischiofemoral (taut)
57. Intracapsular ligaments
1. Ligamentum teres
Within the hip joint, weak
lig
Attacheds at one end of
fovea capitis head of femur,
and the other end to the
acetabular fossa, transverse
acetabular lig and acetabular
notch.
Little importance of
strengthening hip jt
It is only stretched when the
hip is dislocated, and may
then prevent further
displacement
58. Tranverse ligament of the acetabulum
Strong ligament that crosses
over the acetabular notch.
The inferior deficiency in the
acetabular rim (labrum)
completed by transverse
ligament.
59. Acetabular Labrum (Acetabular Rim)
The acetabulum is
deepened by the
fibrocartilaginous
acetabular labrum
Attach to the bony rim of
the acetabulum and to the
transverse ligament
The acetabular labrum cups
around the head, holding it
firmly in the acetabular
socket.
62. Muscles that Move the Hip Joint
Hip Extensor
1. Gluteus maximus
2. Hamstring
1. Biceps femoris
(long head)
2. Semitendinosus
3. semimembranosus
Hip Flexor
1. Psoas major
2. Iliacus
3. Rectus femoris
4. Sartorius
5. Pectineus
63. Muscles that Move the Hip Joint
Hip Abductor
Gluteus maximus
Gluteus minimus
Gluteus medius
Tensor fascia latae
Hip Adductor
Adductor longus
Adductor magnus
Adductor brevis
Gracilis
pectineus
64. Muscles that Move the Hip Joint
Hip Medial Rotator
Gluteus medius
Gluteus minimus
Tensor fascia latae
Psoas major
Iliacus
Hip Lateral Rotator
Gluteus maximus
Piriformis
Obturator internus
Obturator externus
Superior gamellus
Inferior gamellus
quadratus
65. Psoas major
- Origin :transverse processes &
bodies of lumbar vertebrae
- insertion : with iliacus into
lesser trochanter of femur
- action : flexes thigh at hip
joint, flex trunk on the hip as
sitting up from the supine
position
- nerves : lumbar spinal nerves
L2-L3
66. Iliacus muscle
Origin : Iliac fossa and
sacrum
Insertion : with psoas major
into lesser trochanter of femur
action : flexes thigh at hip
joint, flex trunk on the hip as
sitting up from the supine
position
Nerves : Femoral nerve
67. Gluteus maximus
- Origin : iliac crest, sacrum,
coccyx, aponeurosis of
sacrospinalis
- Insertion : iliotibial tract of
fasiae lata and greater
trochanter of femur
- Action : Extends thigh at hip
joint & lateraly rotates thigh
- Nerve : Inferior gluteal nerve
69. Gluteus medius
- Origin : gluteal surface of
ilium
- Insertion : Greater
trochanter of femur
- Action : Abducts thigh at
hip joint and medially
rotates thigh
- Nerve : Superior gluteal
nerve
70. Gluteus minimus
- Origin : gluteal surface of
ilium
- Insertion : Greater
trochanter of femur
- Action : Abducts thigh at
hip joint and medially
rotates thigh
- Nerve : Superior gluteal
nerve
74. Piriformis
- Origin : anterior sacrum
- Insertion : superior border
of greater trochanter of
femur
- Action : laterally rotates &
abducts thigh at hip joint
- Nerve : sacral spinal nerves
S1 or S2
75. Obturator internus
Origin : inner surface of
obturator foramen, pubis,
and ischium
Insertion : medial surface
of greater trochanter of
femur
Action : laterally rotates &
abducts thigh at hip joint
Nerve : nerve to obturator
internus
76. Obturator externus
Origin : outer surface of
obturator membrane
Insertion : deep depression
inferior to greater
trochanter of femur
Action : Laterally rotates &
abducts thigh at hip joint
Nerve : obturator nerve
78. Superior gemellus
Origin : ischial spine
Insertion : medial surface
of greater trochanter of
femur
Action : Laterally rotates &
abducts thigh at hip joint
Nerve : nerve to obturator
internus
79. Inferior gemellus
Origin : ischial tuberosity
Insertion : medial surface
of greater trochanter of
femur
Action : Laterally rotates &
abducts thigh at hip joint
Nerve : nerve to quadratus
femoris
80. Quadratus femoris
Origin : ischial tuberosity
Inserton : elevation
superior to mid-portion of
intertrochanteric crest on
posterior femur
Action : lateraly rotates &
abducts hip joint
Nerve : nerve to quadratus
femoris
82. Adductor longus
Origin : pubic crest and
pubic symphysis
Insertion : linea aspera of
femur
Action : addducts and flexes
thigh at hip joint and laterally
rotates thigh
Nerve : obturator nerve
83. Adductor brevis
Origin : inferior ramus of pubis
Insertion : superior half of
linea aspera of femur
Action : addducts and flexes
thigh at hip joint and medially
rotates thigh
Nerve : obturator nerve
84. Adductor magnus
Origin : inferior ramus of
pubis and ischial tuberosity
Insertion : linea aspera of
femur
Action : adducts thigh at hip
joint and laterally rotates
thigh, anterior part flexes
thigh at hip joint & posterior
part extends thigh at hip joint
Nerve : obturator & sciatic
nerve
85. Pectineus
Origin : superior ramus of
pubis
Insertion : pectineal line of
femur, between lesser
trochanter and linea aspera
Action : flexes and adducts
thigh at hip joint
Nerve : femoral nerve
89. MUSCLES THAT ACT ON THE FEMUR
(THIGH BONE) & TIBIA AND FIBULA
(LEG BONES)
Deep fascia separate the thigh muscles that act on
the thigh bone into compartment
- Medial (Adductor)
- Anterior (Extensor)
- Posterior (Flexor)
91. Gracilis
- origin: body and inferior ramus
of pubis
- Insert : medial surface of body
of tibia
- action : adducts thigh at hip
joint, medially rotates thigh &
flexes le at knee joint
- Nerve : Obturator nerve
93. ANTERIOR (EXTENSOR)
COMPARTMENT
Extend leg at knee joint
Quadriceps femoris:
- largest muscle in the body
- covering the anterior surface & sides
- 4 separate muscles : rectus femoris,
vastus lateralis, vastus medialis,
vastus intermedius
Sartorius muscle – long, narrow, forms a band
across the thigh from the ilium of the hip bone to the
medial side of the tibia
94. Quadriceps femoris
Rectus femoris
Origin : anterior inferior iliac spine
vastus lateralis
Origin : greater trochanter and linea aspera of femur
vastus medialis
Origin : linea aspera of femur
vastus intermedius
Origin : anterior & lateral surfaces of body of femur
95. Quadriceps femoris
All the Quadriceps femoris muscles
insert to patella via quadriceps tendon and then
tibial tuberosity via patellar ligament.
Action : all four heads extend leg at knee joint ;
rectus femoris muscle acting alone also flexes thigh
at hip joint.
Innervation : femoral nerve
99. Sartorius muscle
Origin : anterior superior
iliac spine
Insertion : medial surface
of body of tibia.
Action : flexes leg at knee
joint ; flexes, abducts &
laterally rotates thigh at
hip joint.
Innervation : femoral
nerve
101. Biceps femoris
Origin : long head arises from
ischial tuberosity, short head
arises from linea aspera of
femur
Insertion : head of fibula &
lateral condyle of tibia
Action : flexes leg at knee joint
& extends thigh at hip joint
Innervation : tibial & common
peroneal nerves from the
sciatic nerve
102. Semitendinosus
Origin : ischial tuberosity
Insertion : proximal part of
medial surface of shaft of
tibia
Action : flexes leg at knee
joint & extends at hip joint
Innervation : tibial nerve
from the sciatic nerve
103. Semimembranosus
Origin : ischial tuberosity
Insertion : medial condyle of
tibia
Action : flexes leg at knee
joint & extends at hip joint
Innervation : tibial nerve
from the sciatic nerve
105. Clinical Importance
Fractures the hip joint are known as hip
fractures
Femoral head fracture:
fracture involving the femoral head
due to high energy trauma and a
dislocation of the hip joint
106. Femoral neck fracture:
fracture adjacent to the femoral head in
the neck between the head and the
greater trochanter
damage the blood supply to the femoral
head, potentially causing avascular
necrosis
109. Hamstring Strain / Pulled Hamstring
excessive stretch or tear
of muscle fibers and
related tissues.
Strike athletes of all
sports – runners,
footballer etc.
110. Groin Injury / Groin Pull
Injury to the muscles of
the inner thigh
Groin muscles referred
to adductor group of
muscles
Adductor muscle is
stretched too far
(muscles strain)
Groin pulls are often
seen in athletics who
participate in sports such
as ice hockey and
football.