This study investigated the mechanisms of anterior impingements of the post with the femoral intercondylar notch. Five posterior stabilized prosthesis designs were tested to study using an artificial knee joint simulator. The contact pressure and contact area were measured at five hyperextension angle (5 degrees, 0 degrees, -5 degrees, -10 degrees and -15 degrees) and two axial tibial rotations (0 degrees and 5 degrees) under the applied loads of 100N. Edge loading was found at the anterior corner of the post in the post with flat surface. Understanding the advantage and disadvantage of the polyethylene insert post function may help to develop sophisticated component design.
