Fig. 4.

Illustration of the methods of locating the acetabular centers and installing the acetabular cup. (A) Illustration of the method of locating the acetabular center. The acetabular center was located at 28.7 mm on average above the intersection point of the perpendicular bisector and acetabular anterior and posterior notches' line. (B) Illustration of the method of installing the acetabular cup. The acetabular cup was installed stably on the basis of concentric circles reaming which was aimed at the acetabular center.