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Dive into the research topics where Levent Özçakar is active.

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Featured researches published by Levent Özçakar.


Psychiatry Research-neuroimaging | 2003

Bone mineral density in premenopausal women with major depressive disorder.

Kâzım M. Yazıcı; Ayşen Akıncı; Ayşegül Sütçü; Levent Özçakar

This cross-sectional study investigated whether a group of unmedicated patients with major depressive disorder, single episode, had decreased bone mineral density (BMD). The BMD at the lumbar spine and proximal femur in 25 premenopausal women with major depressive disorder and 15 normal women was measured by dual-energy X-ray absorptiometry. Bone turnover markers and serum cortisol levels were also evaluated for each subject. As compared with values in the normal women, the mean BMD in the depressed women was significantly lower at the lumbar spine and at all sites of the proximal femur. There was no statistically significant difference between serum cortisol levels and bone turnover markers except for significantly higher urinary excretion of deoxypyridinoline cross-links in the patients compared with the controls. In conclusion, depressed women may have decreased BMD even at the very early stages of the illness, and this possibility should be taken into consideration in treatment.


Archives of Physical Medicine and Rehabilitation | 2008

A Comparison of the Benefits of Sonography and Electrophysiologic Measurements as Predictors of Symptom Severity and Functional Status in Patients With Carpal Tunnel Syndrome

Bayram Kaymak; Levent Özçakar; Alp Çetin; Meral Çetin; Ayşen Akıncı; Zafer Hasçelik

OBJECTIVES To clarify whether sonography or electrophysiologic testing is a better predictor of symptom severity and functional status in carpal tunnel syndrome (CTS) and to assess the diagnostic value of sonography in patients with idiopathic CTS. DESIGN Cross-sectional. SETTING University hospital physical medicine and rehabilitation clinic. PARTICIPANTS Thirty-four hands with CTS and 38 normative hands were evaluated. INTERVENTIONS Not applicable. MAIN OUTCOME MEASURES The Boston Carpal Tunnel Questionnaire, which comprised symptom severity and functional status scale, was applied to CTS patients. Bilateral upper-extremity nerve conduction studies of median and ulnar nerves and sonographic imaging of the median nerve were performed in all participants. Sonographic evaluation was performed by a physician blinded to the physical and electrophysiologic findings of the subjects. RESULTS Cross-sectional areas (CSAs) of the median nerve at the carpal tunnel entrance and proximal carpal tunnel were 12.5+/-2.6 and 10.6+/-2.6 versus 15.6+/-4.2 and 11.5+/-3.2 in CTS patients versus controls, respectively. Increased CSA of the median nerve at the carpal tunnel entrance (P<.002) and at the proximal carpal tunnel (P<.000) were detected in the hands with CTS. Flattening ratios did not differ in a statistically significant manner between the groups (P>.05). The best predictor of symptom severity was median nerve sensory distal latency and that of functional status was median nerve motor distal latency. The optimum cutoff value for median nerve CSA was 11.2mm(2) at the carpal tunnel entrance and 11.9mm(2) at the proximal carpal tunnel. Sensitivity, specificity, and positive and negative predictive values at the proximal carpal tunnel (88%, 66%, 71%, 80%, respectively) were higher than those at the carpal tunnel entrance (68%, 62%, 65%, 66%, respectively). CONCLUSIONS The best predictors of symptom severity and functional status in idiopathic CTS seem to be the electrophysiologic assessments rather than sonographic measurements. On the other hand, sonography may be helpful in the diagnosis of idiopathic CTS.


Clinical Rheumatology | 2006

Familial Mediterranean fever responds well to infliximab: single case experience

Salih Ozgocmen; Levent Özçakar; Ozge Ardicoglu; Ercan Kocakoc; Arzu Kaya; Adem Kiris

The most common arthritic involvement in familial Mediterranean fever (FMF) is acute recurrent monoarthritis; however, sometimes spondyloarthropathy-like findings or typical ankylosing spondylitis may also ensue. Reported here is our favorable experience with infliximab in an FMF patient who had been resistant to colchicine and disease-modifying antirheumatic drugs (sulfasalazine and methotrexate) treatments. A 72-week follow-up of the patient yielded complete remission of the febrile abdominal episodes, and spondylitis responded well. The patient’s bilateral aseptic necrosis of the femoral head deteriorated and caused hip pain, discomfort, and disability. Overall, we believe that tumor necrosis factor (TNF) alpha has an important role in the disease pathogenesis and also that anti-TNF may represent a promising robust treatment alternative in FMF.


Journal of Clinical Oncology | 2009

Sonographic and Electrodiagnostic Evaluations in Patients With Aromatase Inhibitor-Related Arthralgia

Omer Dizdar; Levent Özçakar; Fevziye Ünsal Malas; Hakan Harputluoglu; Nilufer Bulut; Sercan Aksoy; Yavuz Ozisik; Kadri Altundag

PURPOSE To investigate the prevalence of arthralgia in breast cancer patients taking aromatase inhibitors (AIs) and perform a detailed rheumatologic assessment including autoimmune serology, musculoskeletal sonography, and electromyography (EMG) in these patients. PATIENTS AND METHODS Postmenopausal patients with stage I to III breast cancer who were taking adjuvant AIs were enrolled (n = 92). Patients who were not receiving hormone treatment were included as a control group (n = 28). Musculoskeletal sonography and EMG were applied to the patients and the controls along with markers of autoimmunity. RESULTS Thirty patients (32.6%) reported to have AI-related new-onset or worsening arthralgia. The most commonly affected joints were knee (70%), wrist (70%), and small joints of the hand (63%). Patients taking AIs had increased tendon thicknesses compared with those who never received AIs (P < .001). Patients with AI-related arthralgia had higher rates of effusion in hand joints/tendons than those without arthralgia (P = .033). More patients with AI-related arthralgia had EMG findings consistent with carpal tunnel syndrome (CTS) than those without arthralgia (P = .024). No significant difference was observed in erythrocyte sedimentation rates, C-reactive protein, antinuclear antibody, antidouble stranded DNA antibody, rheumatoid factor, or anticyclic citrullinated peptide levels between patients and controls or between those with and without arthralgia. CONCLUSION Patients with AI-related arthralgia often show tenosynovial changes suggesting tenosynovitis, exerting local problems but lacking a systemic inflammatory component. Our finding of increased CTS frequency also supports this hypothesis.


International Journal of Dermatology | 2005

Ultrasonographical evaluation of the Achilles’ tendon in psoriasis patients

Levent Özçakar; Alp Çetin; Fatma Inanici; Bayram Kaymak; Cansel Köse Gürer; Fikret Kölemen

Background  Psoriasis is a common dermatological disease with erythematous plaques where articular and extra articular findings (tenosynovitis and enthesitis) may well accompany. The aim of this current study was to evaluate the Achilles’ tendon of psoriasis patients with ultrasonography.


British Journal of Sports Medicine | 2005

Quantification of the weakness and fatigue in thoracic outlet syndrome with isokinetic measurements

Levent Özçakar; Fatma Inanici; Bayram Kaymak; G Abalı; Alp Çetin; Zafer Hasçelik

Objectives: Patients with thoracic outlet syndrome (TOS) complain of many subjective symptoms that are difficult to measure and quantify. In this study we have tried to assess the weakness (muscle strength) and fatigue (endurance) of these patients with an objective measurement method, isokinetic muscle testing. Methods: Twenty three TOS patients and 15 age matched healthy controls were enrolled in the study. Detailed histories of the patients were taken and the patients underwent complete physical examinations. Cervical radiographies, Doppler ultrasonography, electromyography, and isokinetic measurements were carried out. The isokinetic measurements were carried using the Biodex System 3 dynamometer during concentric shoulder flexions and extensions at velocities of 60°/s, 180°/s, and 240°/s. Results: Although the muscle strengths of both groups seemed to be similar, the fatigue ratios of TOS patients at 60°/s and 180°/s were found to be higher compared with those of healthy controls (p = 0.029, p = 0.007). Conclusions: TOS patients were found to have muscular performance similar to controls, but their upper extremities developed fatigue more easily than those of healthy individuals.


Clinical Rheumatology | 2004

An underdiagnosed hip pathology: apropos of two cases with gluteus medius tendon tears

Levent Özçakar; Özlem Erol; Bayram Kaymak; Nihal Aydemir

Until recently, gluteus medius tendon tears have been the sort of hip pathology that is relatively unknown in the realm of rheumatology. Their diagnosis can pose a serious challenge to physicians, despite diligence. In this report we summarize two relevant cases and put forward some hints for their evaluation. Magnetic resonance imaging is quite beneficial in demonstrating the pathology and ruling out other likely pathologies after a prompt physical examination. Physicians should exercise care and vigilance in order not to overlook these cases, in which prompt physical examination and radiological interventions remain a prerequisite in the diagnostic algorithm.


British Journal of Sports Medicine | 2003

Comprehensive isokinetic knee measurements and quadriceps tendon evaluations in footballers for assessing functional performance

Levent Özçakar; B Kunduracyoolu; A Cetin; Bülent Ülkar; R Guner; Z Hascelik

Objectives: To ascertain whether detailed isokinetic knee muscle testing reflects the results of other functional measurements in footballers and to look for any correlations between quadriceps tendon thickness and knee strength. Methods: Ultrasonographic evaluation of the quadriceps tendon (Hitachi EUB-405), isokinetic knee testing (Biodex System 3), and sprint measurements using telemetric photoelectric cells (Chronometre Prosport ESC TX02) were carried out on 29 elite footballers. Jumping capacity was evaluated using Bosco’s jumping mat (Ergojump). Anaerobic fitness was assessed by auricular capillary blood lactate measurements (YSI Model 1500 Sport Lactate Analyzer). Results: Quadriceps tendon thickness correlated positively with jumping and sprint measurements and negatively with extensor and flexor strength. However, these correlations did not reach statistical significance. There were significant correlations between knee extensor strength at 60 °/s and jumping or sprint measurements and between the extension acceleration values of both knees during isokinetic tests at 240 °/s and the sprint measurements. No significant correlation was found between the fatigue ratio values of both knees at 240 °/s and the calculated fatigue ratios from the sprint measurements. Conclusions: Apart from a few variables which correlated with the performance tests, the isokinetic studies did not fully predict the various functional measurements. Neither was there any relation between the quadriceps tendon measurements and the knee strength values nor with the functional performance.


Archives of Physical Medicine and Rehabilitation | 2009

Evaluation of Needle Positioning During Blind Intra-Articular Hip Injections for Osteoarthritis: Fluoroscopy Versus Arthrography

Demirhan Dıraçoğlu; Kerem Alptekin; Fatih Dikici; Halil Ibrahim Balci; Levent Özçakar; Cihan Aksoy

UNLABELLED Diraçoğlu D, Alptekin K, Dikici F, Balci HI, Ozçakar L, Aksoy C. Evaluation of needle positioning during blind intra-articular hip injections for osteoarthritis: fluoroscopy versus arthrography. OBJECTIVE To evaluate needle positioning during blind/anatomically referenced hip joint injections for osteoarthritis (OA). DESIGN Experimental clinical study. SETTING Operating theater of a university hospital. PARTICIPANTS Patients (N=16) (10 women, 6 men), who were diagnosed as having OA according to the American College of Rheumatology criteria and whose radiologic grades were II or III according to Kellgren-Lawrence. INTERVENTIONS Three bilateral and 13 unilateral hip injections were performed (3 times at 1-week intervals). After it was presumed blindly that the needle was within the joint, the location of the needle was checked with backflow technique and fluoroscopy. Entrance to the joint cavity was also ensured by reconfirmation with contrast medium, and the procedure was then terminated with hyaluronic acid injection. MAIN OUTCOME MEASURES Assessment of blind needle placement into the hip joint by using backflow technique, fluoroscopic images, and contrast enhancement. RESULTS The location of the needle was fluoroscopically confirmed to be at the proper position in 38 (66.7%) of the 57 blind interventions. Furthermore, in 29 (76.3%) of those 38 interventions, localization of the intra-articular needle could be confirmed by intra-articular contrast uptake. Overall, 29 of 57 (50.9%) blind interventions exhibited intra-articular contrast enhancement. Backflow was not observed in 23 (79.3%) of these 29 interventions. Five (17.9%) of 28 interventions with no contrast uptake showed backflow. CONCLUSIONS In light of our results, we suggest that blind injection of the osteoarthritic hip joint can be inaccurate even with careful technique. Further, the backflow method does not appear to be reliable, and guidance during the injection seems to be necessary.


Journal of Rehabilitation Medicine | 2012

Musculoskeletal ultrasonography in physical and rehabilitation medicine

Levent Özçakar; Fatih Tok; Martine De Muynck; Guy Vanderstraeten

Musculoskeletal ultrasound has gained a significant place in the diagnosis and management of various musculoskeletal disorders due to its several advantages (being convenient, inexpensive, non-invasive, repeatable, providing dynamic imaging and not requiring any exposure to radiation). It has also become a valuable tool in the daily clinical practice of physical and rehabilitation medicine physicians; the musculoskeletal ultrasound probe having become synonymous with the physicians stethoscope. In this paper, aside from drawing attention to this growing issue in the agenda of PRM physicians, we will touch upon its basic technical features and certain aspects as regards muscle, tendon, ligament, nerve, joint lesions and ultrasound guided interventions.

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Wei-Ting Wu

National Taiwan University

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Ke-Vin Chang

National Taiwan University

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Ke-Vin Chang

National Taiwan University

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