Fig. 3 A-C.

Measurements of acetabular morphology performed in the axial plane are shown. (A) To measure the acetabular version angle 10 mm below the acetabular dome, a line connecting the anterior and posterior rim of the acetabulum was drawn. An orthogonal line to the horizontal line connecting the posterior apex of the ischium was drawn and the angle formed corresponded to the acetabulum anteversion angle. (B) The acetabular anteversion angle was similarly measured at the level corresponding to the center of the femoral heads. (C) The anterior acetabular sector angle (AASA) is the angle formed between a horizontal line connecting the center of both femoral heads and a line connecting the anterior rim of the acetabulum to the center of the femoral head. The posterior acetabular sector angle (PASA) is the angle formed between the horizontal line and a line connecting the posterior acetabulum rim and the center of the femoral head.