Fig. 3.

3D models of the right acetabulum. A The anterior and posterior edges of the AIIS are identified at the anterior–superior acetabular rim. B Example of the posterior type wherein the inflection point is located on the posterior AIIS edge. C Example of the anterior type wherein the inflection point is located on the anterior AIIS edge (solid line, anterior AIIS edge; dotted line, posterior AIIS edge; and asterisk, inflection point of acetabular rim)