Influence of Pelvic Tilt on Polyethylene Wear after Total Hip Arthroplasty

Figure 1

Radiographs of a 72-year-old woman treated with right hip THA. An HXLPE liner was implanted, and the annual polyethylene wear rate was 0.008 mm/year. (a) AP pelvic radiograph in the supine position 5 years after THA; cup inclination was 46°, cup anteversion was 16°, and PTA was 31°. (b) AP pelvic radiograph in the standing position shows that the pelvis is tilted posteriorly. The PTA was 59°, leading to an increase in cup inclination and anteversion; moreover, cup inclination was 52° and cup anteversion was 38°.

(a)

(b)