Fig. 2.

Method. The long (AB; length a) and short (CD; length b) axes of the ellipse are drawn which intersect each other at a right angle at point O. Radius of acetabular component is measured as half of length AB (a/2; length OA) (a). The angle of anteversion is drawn after marking a point on the long axis such that its distance from the point of intersection of the short axis and acetabular ring (point D) equals the radius of acetabular component (b). The angle DXO is the angle of anteversion. Measurement of actabular anteversion in uncemented total hip replacement (c)