In vivo Verification of Different Hip Joint Center Estimation Methods in Gait Analysis for Healthy Subjects

Hip joint is one of the most stable joints in human body. It has intrinsic stability provided by its relatively rigid ball and socket configuration. The hip joint also has a wide range of motion, which allows normal locomotion and daily activities. Location of hip joint center (HJC) is an important parameter in gait analysis, biomechanical and clinical research laboratories to calculate human lower extremity kinematics and kinetics. Inaccuracies in estimation of hip joint center are shown to propagate errors in kinematic and kinetic calculations of lower extremitie

The Relationship Between Arthroplasty Surgeons' Experience Level and Optimal Cable Tensioning in the Fixation of Extended Trochanteric Osteotomy

Introduction: In this study, our aim was to examine the relationship between the arthroplasty surgeons' experience level and their aptitude to adjust the cable tension to the value recommended by the manufacturer when asked to provide fixation with cables in artificial bones that underwent extended trochanteric osteotomy (ETO). Materials and Methods: A custom-made cable tensioning device with a microvoltmeter was used to measure the tension values in Newtons (N). An ETO was performed on 4 artificial femur bones. Surgeons at various levels of experience attending the IXth National Arthroplasty Congress were asked to fix the osteotomized fragment using 1.7-mm cables and the tensioning device. The participants' demographic and experience data were investigated and recorded. The surgeons with different level of experience repeated the tensioning test 3 times and the average of these measurements were recorded. Results: In 19 (35.2%) of the 54 participants, the force applied to the cable was found to be greater than the 490.33 N (50 kg) value recommended by the manufacturer. No statistically significant difference was determined between the surgeon's years of experience, the number of cases, and the number of cables used and the tension applied over the recommended maximum value (P = .475, P = .312, and P = .691, respectively). Conclusions: No significant relationship was found between the arthroplasty surgeon's level of experience and the adjustment of the cable with the correct tension level. For this reason, we believe that the use of tensioning devices with calibrated tension gauges by orthopedic surgeons would help in reducing the number of complications that may occur due to the cable

Computer simulation of dynamic behavior of pneumatic tires

Ph.D. - Doctoral Progra

Yumuşak Biyolojik Dokuların Mekanik Malzeme Kanununun Ve Malzeme Katsayılarının Evrik Sonlu Elemanlar Yöntemiyle Belirlenmesi İçin Mevcut İndentör Cihazının Güncellenmesi.

Kapsam: TÜBİTAK MİSAG-183 proje desteğiyle tasarlanıp üretilen indentör cihazında bugüne kadarki kullanımda görülen eksikliklerin giderilmesi ve sistemin günümüz teknolojik düzeyiyle uyumlu hale getirilmesi. Yöntem: Mevcut sistemdeki adım motoru ve sürücü kartının yenilenmesi ile sistemin yumuşak adım atması, yük hücresinin yenilenmesi ile kullanımda hasar gören yük hücresinden daha hassas yumuşak doku tepki kuvveti elde edilmesi, veri toplama kartının yenilenmesiyle sistemin gerçek zamanlı denetlenmesi ve mototun hassas denetimi hedeflenmektedir. Beklenen Bulgu: Yumuşak doku mekanik malzeme kanunu ve bu kanuna ait katsayıların belirlenmesi ve bunun insan bedeninin çevre ile mekanik etkileşiminin bilgisayarda modellenmesi için kullanılması