Abstract
Impingement problem of femoral component and polyethylene insert after total knee arthroplasty (TKA) has been recently brought to light by contact pressure analysis using the knee joint simulator. Therefore, adequate motion analysis is important for estimating the impingement between components and improving postoperative exercise. The purpose of this paper is to analyze the impingement of TKA components during stair claiming activity in vivo. Ten patients with posterior-stabilized (PS) TKA were examined in stair claiming activity. The 3-D position and orientation of the implant components were determined using image matching technique. The 6-DOF of each component was able to be reproduced on 3-D CAD. Kinetic relation between the femoral component and polyethylene insert was calculated, and then the impingent was analyzed. In the result, impingement of the femoral intercondylar notch and anterior aspect of the tibial post was observed in extension of stair claiming activity. This study helps the surgeon be more aware about impingement between components under some conditions and is useful to improve the design of artificial knee joint.
