Fig. 6

Stress distribution of different areas of acetabulum under various abduction angles. When the hip was flexed at 90° and abducted at 45°, the stress was mainly concentrated posteriorly. With the angle increased to 65°, the stress on the anterior area increased correspondingly, but the stress on the posterior had not increased significantly, and distribute the pressure over the contact area more uniformly between the femoral head and the u-shaped notch, without excessive pressure on the femoral head. However, when the abduction of the hip was increased to 80°, CCP on the anterior and posteromedial acetabulum increased significantly, and the corresponding anterolateral and lateral stresses of the femoral head increased significantly