抄録
Hip Osteoarthritis (OA) is often caused by dysplasia and subluxation. Patients with severe OA are operated on total hip arthroplasty (THA). Impingement has been reported after THA and rotational osteotomy. Therefore, the functional assessment of hip joint has been investigated in many research groups. It is necessary that quantify the hip kinematics of the normal subjects and patients with severe OA. Therefore, this study aimed to perform motion analysis of hip joint. The image matching technique was performed determining the strength of correlation between the single-plane X-ray images and the computational simulated image from three-dimensional gray-scale model. The accuracy of this analysis method is within 0.3 mm and 0.3 degrees. In this report, we analyzed the extension activity from deep flexion and chair targeting six normal subjects and eleven OA patients. In both activities, the maximum hip flexion/extension of OA patients was significantly smaller than that of normal subjects, but the posterior tilt of pelvis at OA patients was bigger than that of normal subjects. The pelvis is tilted posteriorly for bending the femur, because the range of movement of OA patients is limited. In this study, we could be confirmed different kinematic patterns between normal subjects and OA patients.
