Browsing by Author "Yilmaz, Baris"

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Analysis of Subcutaneous Anterior Transposition versus in-situ Decompression of Ulnar Nerve with Force Transducer in Cadaver Specimen
(TURKISH NEUROSURGICAL SOC, 2020-01-01) Kilinc, Bekir Eray; Celik, Haluk; Oc, Yunus; Unlu, Ruhat; Keskinoz, Elif Nedret; Yilmaz, Baris
AIM: To evaluate the changes in the pressure values of the ulnar nerve after in-situ decompression and anterior subcutaneous transposition of the ulnar nerve. MATERIAL and METHODS: The ulnar nerve was released in the postcondylar groove. An ultrathin (100 lm) force transducer was embedded between the posterior of the ulnar nerve and the anterior of the medial epicondyle. The elbow joint was flexed from full extension position to maximum flexion and was measured to obtain the maximum stress at 0 degrees, 45 degrees, 90 degrees, and 135 degrees of flexion. Then, the ulnar nerve was transposed anterior subcutaneously. The same measurement was applied to the two procedures. Data were compared between the two surgical techniques. RESULTS: Our study was performed on the right upper extremities of eight (seven men and one woman) fresh frozen cadavers. The mean age of the cadavers was 67.25 +/- 12.2 years. Mean values of 0 degrees, 45 degrees, 90 degrees, and 135 degrees of flexion after the ulnar nerve insitu decompression were 0.41, 0.9, 1.7, and 4.3 N, respectively. Mean values of 0 degrees, 45 degrees, 90 degrees, and 135 degrees of flexion after anterior transposition of the ulnar nerve were 0.3, 0.73, 1.63, and 2.15 N, respectively. No significant difference was noted between the two groups in terms of 0 degrees, 45 degrees, and 90 degrees of flexion values. However, there was a significant difference between the two groups in the 135 degrees of flexion measurement values. CONCLUSION: Anterior transposition is a more appropriate technique than in-situ decompression in the treatment of cubital tunnel syndrome that does not respond to conservative treatment regardless of the severity of the symptom.
Comparing Dimensions of Four-Strand Hamstring Tendon Grafts with Native Anterior and Posterior Cruciate Ligaments
(HINDAWI LTD, 2016-01-01) Yilmaz, Baris; Ozdemir, Guzelali; Keskinoz, Elif N.; Tumentemur, Gamze; Gokkus, Kemal; Demiralp, Bahtiyar
Background. The aim of the study was to evaluate whether or not there was any incompatibility between four-strand hamstring tendons taken from the same knee and the dimensions of the ACL and PCL. Methods. 15 fresh frozen cadaver hamstrings were prepared as four-strand grafts and measurements made of the ACL and PCL circumferences in the midsection were made in the narrowest part of the midsection. The cross-section areas and diameters were calculated with geometric calculations used to measure the cross-sectional area of cylinders. Accepting that the geometric insertions were elliptical, the length, width, and area were calculated for entry areas. Results. A significant relationship at 96.2\% was determined between the ACL mid and the hamstring diameter. A significant relationship at 96.7\% was determined between the ACL and the hamstring mid area. A significant relationship at 96.4\% was determined between the PCL mid and the hamstring diameter. A significant relationship at 95.7\% was determined between the PCL and the hamstring mid area. Conclusion. For the reconstruction of ACL and PCL, it was determined that there is less incompatibility between the four-strand hamstring tendons taken from the same knee and the dimensions of the midsection PCL compared to the ACL dimensions.
Hamstring autograft and anatomical footprint evaluation for anterior talofibular ligament reconstruction: Cadaveric study
(SAGE PUBLICATIONS LTD, 2020-01-01) Karahan, Nazim; Kaya, Murat; Yilmaz, Baris; Kurdal, Demet Pepele; Keskinoz, Elif Nedret; Cicek, Esma Esin Derin
Purpose: The aim of the study was to evaluate whether or not there was any incompatibility between two-strand hamstring tendons taken from the same knee and the ATFL and it was the determination of suitable footprint points in the fibula and talus for anatomical ATFL reconstruction. Methods: 16 fresh frozen cadaver specimens were dissected to gracilis and semitendinosus tendons and the anterior talofibular ligament. The origins, insertions, distances from osseous landmarks of fibular talus of ATFL were determined. The diameters of gracilis, semitendinosus and ATFL were calculated. There was a moderate correlation between body height and the distance between the distal of inferior lateral malleolus and the fibular adhesion site of ATFL (r: 36.5 p: 0.036). There was a weak correlation between body height and the distance between the apex of the lateral talar process and the talus adhesion site of ATFL in a single bundle (r: 28.4 p: 0.002). There was no correlation between the distance from proximal and distal adhesion side of ATFL and body height in the double bundle (p: 0.241). Results: There was no significant relationship between ATFL diameter and gracilis, semitendinosus and both hamstring in women. A significant relationship at 80.5\% was determined between the ATFL and the gracilis diameter in man. A significant relationship at 92.6\% was determined between the ATFL and the semitendinosus diameter in man. Conclusion: It was determined that there is not compatibility between the gracilis tendons, the semitendinosus tendon and ATFL in women. It should be supported by biomechanical and clinical studies whether this incompatibility has a clinical effect or not.