This picture demonstrates the measuring method of the geometry of the proximal femur. Proximal femoral length (PFL) was the distance between the tip of the greater trochanter and the crossing point, which was made between femoral shaft axis and line drawn at 130° to the femoral shaft axis from the inferior margin of the femoral neck (central line of the proximal femur). The anteroposterior bending angle (APBA) was formed by the femoral shaft line and a line between the greater trochanteric tip and the crossing point. Arrow indicates the impingement point.