Fig. 1.

(A) Overlaying the transparency of the acetabular component on the normal side. The white arrow on the left side indicates the upper lateral border of the acetabulum. The white arrow on the right side indicates the teardrop. The center of rotation (CR) of the hip is marked on the transparency and is indicated by the black arrow. (B) Köhler's iliosciatic line. The white arrow indicates Köhler's iliosciatic line. The size of the acetabular component should not go beyond the iliosciatic line. The black arrow indicates the center of rotation.