Browsing by Author "Dogan, A"

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Anatomical Characteristics of the Tibial Medullary Canal and Their Implications for Intramedullary Fixation
(Sage Publications Ltd, 2003) Tosun, N; Aydinlioglu, A; Akpinar, F; Dogan, A; Islam, C
The use of intramedullary fixation methods in the tibia is limited by the anatomical characteristics of this bone. In this study, the shape and degree of axial lateral rotation of the medullary canal were determined in 45 human dry cadaver bones using X-ray and computed tomography examinations and direct measurement of rotation in inserted nails. Forty bones (88.8%) had slight and five bones (11.1%) had excessive anterior bowing along the tibial shaft. Six of the 45 bones (13.3%) had an extremely narrow medullary canal. Axial lateral rotation was demonstrated in the middle third of the medullary canal, being on average (+/- SD) 32.35 +/- 16.25degrees (range 10 - 75degrees). This study revealed that extreme narrowing of the medullary canal, axial lateral rotation of the medullary canal, and extreme anterior bowing of the tibial shaft are the anatomical characteristics most likely to cause difficulties when using intermedullary fixation in the tibia.
Bilateral Median Nerve Compression at the Level of Struthers' Ligament - Case Report
(Amer Assoc Neurological Surgeons, 2000) Aydinlioglu, A; Cirak, B; Akpinar, F; Tosun, N; Dogan, A
Struthers' ligament syndrome is a rare cause of median nerve entrapment. Bilateral compression of the median nerve is even more rare. It presents with pain, sensory disturbance, and/or motor function loss at the median nerve's dermatomal area. The authors present the case of a 21-year-old woman with bilateral median nerve compression caused by Struthers' ligament. She underwent surgical decompression of the nerve on both sides. To the authors' knowledge, this case is the first reported bilateral compression of thp median nerve caused by Struthers' ligament. The presentation and symptomatology of Struthers' ligament syndrome must be differentiated from median nerve compression arising from other causes.
Effect of Iba on Rooting of Rosa Canina Hardwood Cuttings From Lake Van Region, Turkey
(international Society Horticultural Science, 2005) Kazankaya, A; Yörük, E; Dogan, A
In this study, rooting capacity was investigated for some genotypes of Rosa canina L., growing in four districts in the Lake Van Region in eastern Turkey. Hardwood cuttings were collected in November, December, January and February and rooted in perlite medium, using 0, 1000, 2500, 5000 or 10000 ppm IBA (3-indolebutyric acid). Highest rooting (65-70%) was obtained in cuttings collected in November and treated with 2500 ppm IBA, whereas cuttings collected in February and treated with 1000 ppm IBA showed the lowest rooting (2.5%). The internal IBA levels of November-cuttings treated with 2500 ppm were determined by high performance liquid chromatography (HPLC) after rooting, reaching a maximum of 1.525 mu g/g at 30 days after rooting.
Effects of Glutaraldehyde on Synovial Tissue
(Cambridge Med Publ, 2003) Tosun, N; Akpinar, F; Dogan, A
This study investigated the effect of glutaraldehyde on the synovial tissue of rabbits. Four different concentrations of glutaraldehyde solution were injected into one knee and the contralateral glenohumeral joint of rabbits in group A to group D. The concentration levels used in group A and group B were 1000 ppm and 100 ppm, respectively. For group C and group D, samples of rinsing solutions obtained by rinsing arthroscopic equipment with 1 1 or 2 1 of isotonic saline, respectively, after immersion in 2% glutaraldehyde were used. The contralateral knee and ipsilateral glenohumeral joint of the same rabbits were injected with saline and used as control sites. Rabbits were sacrificed after 1 day, 7 days or 15 days and the histopathological changes in the synovial tissues were compared. The most dramatic inflammatory changes were observed in group A and group B. The histopathological changes were-greater after 7 days than after 1 day or 15 days. Group C and group D showed no significant differences when compared with normal synovium. A correlation between the concentration of the glutaraldehyde solution and the number of inflamed joints was observed. Very few or no inflamed joints were seen when samples from rinsing solutions of 11 or 2 1 of saline, respectively, were used.
Evaluation of the Patellofemoral Joint With Kinematic Mr Fluoroscopy
(Elsevier Science inc, 2002) Harman, M; Dogan, A; Arslan, H; Ipeksoy, U; Vural, S
Objective: The aim of this study was to evaluate the diagnostic effectiveness of kinematic magnetic resonance fluoroscopy (KMRF) on patients with patellofemoral incongruency. Materials and methods: 17 patients (20 knees) and 10 healthy volunteers (20 knees), all men (mean age 29.4 years, S.D. 9, range 16-50), were included to our study. Only male subjects were studied because of potential biomechanical differences between sexes. KMRF was used to perform kinematic MR imaging of patellar alignment and tracking in 10 healthy Subjects and 17 patients with a provisional clinical diagnosis of abnormal patellofemoral joints. The patellofemoral joints were examined with the knee in different angles of active flexion. At each knee position, real time kinematic and axial MRF image Was used to focus on the sagittal plane, followed by an axial image focused through the middle of the patella. Three angles were measured: patellar tilt angle (PTA), sulcus angle (SA) and congruence angle (CA). Results: Five patterns of malalignment were identified and studied. Two patellofemoral joints were normal, 10 had lateralization of the patella, 2 had patellar tilt, 2 had lateralization and patellar tilt (i,e. excessive lateral pressure syndrome) and 4 had medialization of the patella. Conclusion: KMRF is an effective method in evaluating patellofemoral incongruency. Short time duration of investigation, ability to get nearly real time images, suitable temporal contrast resolution and investigation from very different angles of knee are important advantages of the method. (C) 2002 Elsevier Science Inc. All rights reserved.
Mr Arthrography in Chondromalacia Patellae Diagnosis on a Low-Field Open Magnet System
(Elsevier Science inc, 2003) Harman, M; Ipeksoy, U; Dogan, A; Arslan, H; Etlik, O
Objective: The purpose of this study was to compare the diagnostic efficacy conventional MRI and MR arthrography (MRA) in the diagnosis of chondromalacia patella (CP) on a low-field open magnet system (LFOMS), correlated with arthroscopy. Subjects and methods: Forty-two patients (50 knees) with pain in the anterior part of the knee were prospectively examined with LFOMS, including T1-weighted, proton density-weighted and T2-weighted sequences. All were also examined T1-weighted MRI after intraarticular injection of dilue gadopentetate dimeglumine. Two observers, who reached a consensus interpretation, evaluated each imaging technique independently. Thirty-six of the 50 facets examined had chondromalacia shown by arthroscopy, which was used as the standard of reference. The sensitivity, specificity and accuracy of each imaging technique in the diagnosis of each stage of CP were determined and compared by using the McNemar two-tailed analysis. Results: Arthroscopy showed that 16 facets were normal. Four (30%) of 13 grade 1 lesions were detected with T1. Four lesions (30%) with T2 and three lesions (23%) with proton-weighted images were detected. Seven (53%) of 13 grade 1 lesions were detected with MRA. Grade 2 abnormalities were diagnosed in two (33%) of six facets with proton density-weighted pulse sequences, two (33%) of six facets with T1-weighted pulse sequences, in three (50%) of six facets with T2-weighted pulse sequences, in five (83%) of six facets with MRA sequences. Grade 3 abnormalities were diagnosed in three (71%) of seven facets with proton density- and T1-weighted images, five (71%) of seven facets with T2-weighted pulse sequences, six (85%) of seven facets with MRA sequences. Grade 4 CP was detected with equal sensitivity with T1-, proton density- and T2-weighted pulse sequences, all showing seven (87%) of the eight lesions. MRA again showed these findings in all eight patients. All imaging techniques were insensitive to grade 1 lesions and highly sensitive to grade 4 lesion, so that no significant difference among the techniques could be shown. Conclusion: All imaging technique studied had high specificity and accuracy in the detection and grading of CP; however, MRA was more sensitive than T1-weighted and proton density-weighted MR imaging on a LFOMS. Although the arthrographic techniques were not significantly better than T2-weighted imaging, the number of false-positive diagnosis was greatest with T2-weighted MRI. (C) 2003 Elsevier Science Inc. All rights reserved.
Rocky Form Giant Synovial Chondromatosis: a Case Report
(Springer, 2006) Dogan, A; Harman, M; Uslu, M; Bayram, I; Akpinar, F
We report a case of painless synovial chondromatosis with an extremely large mass at the popliteal area related to the right knee joint. A hard mass at the posterior aspect of the knee was the only complaint reported by the patient. Plain X-ray studies revealed punctuated calcifications both intra-articularly and around the knee joint. With the surgical procedure performed subsequently, multiple rocky-hard giant chondroid nodules were excised from the posterior aspect of the knee. After 9 months following the surgery, the patient had full range of motion, and no complaints. We emphasize on the importance this case because these lesions may simulate tumors, and lead to misdiagnosis.