Gurhan Donmez
Hacettepe University, Sports Medicine, Faculty Member
Objective Recent studies showed a potential of magnetic resonance imaging (MRI), which can be used as an additional tool for diagnosing cartilage degeneration in the early stage. We designed a cross-sectional study in order to evaluate... more
Objective Recent studies showed a potential of magnetic resonance imaging (MRI), which can be used as an additional tool for diagnosing cartilage degeneration in the early stage. We designed a cross-sectional study in order to evaluate knee joint cartilage adaptation to running, using 3.0-T MRI equipped with the 3-dimensional turbo spin echo (VISTA = Volume ISotropic Turbo spin echo Acquisition) software. By this thickness (mm) and signal intensity (mean pixel value) can be quantified, which could be closely related to the fluid content of the knee joint cartilage, before and after running. Methods A total of 22 males, aged 18 to 35 years, dominant (right) and nondominant (left) knees were assessed before and after 30 minutes of running. Cartilage thickness and signal intensity of surfaces of the patella, medial and lateral femoral and tibial condyles were measured. Results Cartilage thickness of the lateral condyle decreased at the dominant knee, while it increased at the medial ti...
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Traumatic dental and facial injuries are frequent in sports and often cause esthetic, functional, psychological, and economic problems. The term "weekend... more
Traumatic dental and facial injuries are frequent in sports and often cause esthetic, functional, psychological, and economic problems. The term "weekend warrior" is used to describe people who participate in physically demanding activities only on the weekend, or part-time. In this prospective cohort study, we examined the prevalence of dental trauma and knowledge of traumatic dental injuries among weekend warriors in Ankara, Turkey. A detailed questionnaire on mouthguard awareness and knowledge and experience of dental trauma was distributed to 1,007 weekend warrior athletes participating in a soccer tournament. The results showed that 9.8% of participants had experienced orofacial trauma, 21.7% were aware of mouthguards, 2.9% reported using mouthguards, 15.4% were aware of the field of sports dentistry, and 19.6% were aware of emergency treatment for dental trauma. Participation in sports, especially contact sports, greatly increases the risk of dental injury. The present results show that knowledge of traumatic orofacial and dental injuries is limited among weekend warriors. Public health authorities should develop relevant educational programs, including broad dissemination of information on the risks of traumatic dental injuries and methods for protection against such injuries.
Research Interests: Dentistry, Soccer, Knowledge, Prospective studies, Humans, and 9 moreFemale, Male, Young Adult, Awareness, Athletes, Middle Aged, Adult, Tooth injuries, and Oral Science
Platelet-rich plasma (PRP) application has gained widespread interest for musculoskeletal injuries. Nonsteroidal antiinflammatory drugs are frequently used in sports medicine before and/or after PRP application. Our study seeks to... more
Platelet-rich plasma (PRP) application has gained widespread interest for musculoskeletal injuries. Nonsteroidal antiinflammatory drugs are frequently used in sports medicine before and/or after PRP application. Our study seeks to determine whether serum levels of platelet-derived growth factor-AB (PDGF-AB) and vascular endothelial growth factor (VEGF) levels of PRP would be affected by nonsteroidal antiinflammatory drugs. Two different final concentrations of diclofenac (0.5 μg mL(-1) and 2.5 μg mL(-1)), meloxicam (0.8 μg mL(-1) and 2.0 μg mL(-1)), and acetylsalicylic acid (final concentration 450 μm) were obtained in separate tubes with PRPs prepared from 20 healthy male volunteers. Medicine-free PRP was the control group. Growth factors were measured using ELISA. PDGF-AB and VEGF serum levels did not change with diclofenac, meloxicam, or acetylsalicylic acid addition. PDGF-AB and VEGF serum levels correlated with each other. Diclofenac, meloxicam, and acetylsalicylic acid did not...
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The aim of this study was to investigate the effects of short-term, high-magnitude whole-body vibration (WBV) on serum type I collagen turnover in immobilized rats. Thirty Wistar albino rats were randomly divided into the following 5... more
The aim of this study was to investigate the effects of short-term, high-magnitude whole-body vibration (WBV) on serum type I collagen turnover in immobilized rats. Thirty Wistar albino rats were randomly divided into the following 5 groups: immobilization (IS), immobilization + remobilization (IR), immobilization + WBV (IV), control (C), and WBV control (CV). Immobilization was achieved by casting from the crista iliaca anterior superior to the lower part of the foot for 2 weeks. The applied WBV protocol involved a frequency of 45 Hz and amplitude of 3 mm for 7 days starting a day after the end of the immobilization period. Serum type I collagen turnover markers were measured by using ELISA kits. Serum NH2-terminal propeptide of type I collagen (PINP) levels were significantly lower in the immobilization groups (p < 0.02) compared with the control groups. Although WBV improved PINP levels in the control groups, there were no differences in PINP levels among the immobilization groups. Similarly, serum COOH-terminal telopeptide of type I collagen (CTX) levels were higher in the WBV controls than their own controls (p < 0,05). Immobilization led to deterioration of tendon tissue, as observed by histopathological analysis with a transmission electron microscope. Although 1 week of WBV had a positive effect on type I collagen turnover in controls, it is not an efficient method for repairing tissue damage in the early stage following immobilization.
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Little leaguer's shoulder is a syndrome involving the proximal humeral epiphyseal plate and has been reported in adolescent athletes between 13-16 years of age. We present an adolescent case with radiological findings of little leaguer's... more
Little leaguer's shoulder is a syndrome involving the proximal humeral epiphyseal plate and has been reported in adolescent athletes between 13-16 years of age. We present an adolescent case with radiological findings of little leaguer's shoulder syndrome in a non-athletic patient. The patient had applied significant rotational stress to the proximal humeral physis as a result of overuse due to physiotherapy, but the left asymptomatic side appeared more affected radiologically, which led to the idea that this may be a physiological change that occurs in adolescents. We thus evaluated the anteroposterior radiography of 10 healthy male adolescents of the same age with no skeletal or muscular complaints. We demonstrated a minimal widening of the lateral part of the proximal humeral epiphysis in two of these 10 patients. We believe little leaguer's shoulder should also be considered in adolescents with proximal humeral pain and a history of overuse. A larger study must be conducted to investigate whether these finding may be a variation of physiological development.
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Reported here is a 20-year-old male suffered a hamstring strain after a prolonged bout of swimming. After ultrasound imaging, the patient's injury was considered to be the result of nearby osteochondromas. Case reports have been... more
Reported here is a 20-year-old male suffered a hamstring strain after a prolonged bout of swimming. After ultrasound imaging, the patient's injury was considered to be the result of nearby osteochondromas. Case reports have been previously published concerning anterior cruciate ligament injury, rotator cuff tears, subacromial impingement, or femoroacetabular impingement in multiple osteochondromatosis. However, to the best of our knowledge, this is the first reported case of a hamstring injury secondary to an osteochondroma.
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The Achilles tendon is the strongest and thickest tendon in the human body. It is also the commonest tendon to rupture. It begins near the middle of the calf and is the conjoint tendon of the gastrocnemius and soleus muscles. The relative... more
The Achilles tendon is the strongest and thickest tendon in the human body. It is also the commonest tendon to rupture. It begins near the middle of the calf and is the conjoint tendon of the gastrocnemius and soleus muscles. The relative contribution of the two muscles to the tendon varies. Spiralisation of the fibres of the tendon produces an area of concentrated stress and confers a mechanical advantage. The calcaneal insertion is specialised and designed to aid the dissipation of stress from the tendon to the calcaneum. The insertion is crescent shaped and has significant medial and lateral projections. The blood supply of the tendon is from the musculotendinous junction, vessels in surrounding connective tissue and the osteotendinous junction. The vascular territories can be classified simply in three, with the midsection supplied by the peroneal artery, and the proximal and distal sections supplied by the posterior tibial artery. This leaves a relatively hypovascular area in the mid-portion of the tendon where most problems occur. The Achilles tendon derives its innervation from the sural nerve with a smaller supply from the tibial nerve. Tenocytes produce type I collagen and form 90% of the cellular component of the normal tendon. Evidence suggests ruptured or pathological tendon produce more type III collagen, which may affect the tensile strength of the tendon. Direct measurements of forces reveal loading in the Achilles tendon as high as 9 KN during running, which is up to 12.5 times body weight.
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A comprehensive and thorough selection of contributions from across the world, this book aims to review the current state-of-the-art in assessment and management of the patellofemoral joint. While featuring a wide range of surgical... more
A comprehensive and thorough selection of contributions from across the world, this book aims to review the current state-of-the-art in assessment and management of the patellofemoral joint. While featuring a wide range of surgical techniques for different pathologies, detailed attention is also devoted to conservative treatment and approaches involving mesenchymal stem cells, autologous chondrocyte implantation, platelet-rich plasma, and pulsed electromagnetic fields. Anatomy, clinical examination, and methods of evaluation are discussed, and individual chapters address important miscellaneous topics, including rehabilitation, complications of surgery, injuries in specific patient populations, and scoring systems. Though patellofemoral joint pathology is a frequent clinical problem, its management remains challenging for the orthopaedic surgeon. Conceived at the ISAKOS Congress held in Toronto in June 2013 as a small booklet, this work quickly turned into a major project involving ...
This study was intended to investigate the healing properties of open and percutaneous techniques in a rabbit model and compare histological, electron microscopical, and biomechanical findings of the healed tendon between the groups.... more
This study was intended to investigate the healing properties of open and percutaneous techniques in a rabbit model and compare histological, electron microscopical, and biomechanical findings of the healed tendon between the groups. Twenty-six rabbits were randomly assigned to two groups of thirteen rabbits each. Percutaneous tenotomy of the Achilles tendon (AT) was applied through a stab incision on the right side 1.5 cm above the calcaneal insertion in all animals. Using the same Bunnell suture, the first group was repaired with the open and the second group was repaired with the percutaneous method. ATs were harvested at the end of eight weeks for biomechanical and histological evaluation. When the sections were evaluated for fibrillar density under electron microscopy, it was noted that fibrils were more abundant in the percutaneous repair group. The tendon scores in the percutaneous group were less than the open group indicating closer histological morphology to normal. The di...
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ABSTRACT Muscle injuries among athletic population are common and often occur during sportive activities or training. Most sports-related muscle injuries involve strains, contusions, and uncommonly ruptures. These injuries are responsible... more
ABSTRACT Muscle injuries among athletic population are common and often occur during sportive activities or training. Most sports-related muscle injuries involve strains, contusions, and uncommonly ruptures. These injuries are responsible for a large proportion of time lost to competition, and particularly for all professional athletes, rapid return to training and competition is a priority. This chapter will discuss the etiology, risk factors, classification, treatment, and possible complications of common types of muscle injuries under the lights of current literature and recent trends.
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Reported here is a 22-year-old professional wrestler who was diagnosed to have Paget-Schroetter syndrome after Greco-Roman wrestling. On substantial neuromuscular examination and laboratory testing, he was found to have also thoracic... more
Reported here is a 22-year-old professional wrestler who was diagnosed to have Paget-Schroetter syndrome after Greco-Roman wrestling. On substantial neuromuscular examination and laboratory testing, he was found to have also thoracic outlet syndrome and heterozygous mutations for factor V Leiden and methyltetrahydrofolate reductase genes. To the best knowledge of the authors, the concomitance of these pathologies is discussed for the first time in the literature.