Figure 4From: An accurate method of radiological assessment of acetabular volume and orientation in computed tomography spatial reconstruction Steps to determining the acetabular axis: (a) Generating a set of section planes (parallel to the acetabular-opening plane); (b) finding the curve that is the intersection of section planes with acetabular surface, and subsequent marking of points over the curve; (c) fitting the circles to the intersection points and establishing the acetabular axis by finding an average trend line that joins the centers of the circles. Back to article page