Fig. 1.

A schematic of the pelvis shows the measurements taken from the patients’ CT scans. Femoral offset (FO) is the distance between the axis of the proximal third of the femoral diaphysis and the femoral center of rotation. Femoral antetorsion (FA) is based on the posterior condyles. The height of the greater trochanter (TH) is the vertical distance between the femoral center of rotation and the tip of the greater trochanter. The acetabular offset (AO) is the distance between the acetabular center of rotation and the sagittal pelvic plane.