S0202-1-2 Examination of evaluation approach in rotation stability of knee joint prosthesis

Abstract

This study investigated the contact pressure of the femoral component and polyethylene insert in internal/external rotation. Two posterior stabilized prosthesis designs were tested to study using an artificial knee joint simulator. The contact pressure and contact area were measured at four flexion angle (0 degrees, 45 degrees, 90 degrees and 135 degrees) and five axial tibial rotations (0 degrees, 5 degrees, 10 degrees, 15 degrees and 20 degrees) under the applied loads of 1200N. With an internally rotated tibia, the contact stress increased significantly and the contact area decreased significantly. Additionally, Edge loading was found at the polyethylene insert at 20 degrees of tibial rotation. Understanding the advantage and disadvantage of the polyethylene insert function may help postoperative instruction.