Fig. 1.

A computed tomography scan of bilateral ABG II ceramic-on-ceramic hip replacements (Stryker Howmedica Osteonics, Allendale, New Jersey). In the previously reported case of this patient²⁴, the right hip had excessive acetabular anteversion and it squeaked with walking. The left hip with ideal anteversion did not squeak. (Reprinted, with permission, from: Walter WL, O'Toole GC, Walter WK, Ellis A, Zicat BA. Squeaking in ceramic-on-ceramic hips: the importance of acetabular component orientation. J Arthroplasty. 2007;22:496-503.)