Rapid Hip Osteoarthritis Development in a Patient with Anterior Acetabular Cyst with Sagittal Alignment Change

Figure 4

Alignment change assessment using the standing lateral X-ray. The pelvic tilt was defined as the angle between the vertical line and the anterior pelvic plain, which was constructed by the line passing through the midpoint of the bilateral anterior iliac spines and the midpoint of the bilateral pubic tubercles. At the time of right THA (a), the pelvic tilt angle was 4°. At the time of left THA, the pelvic tilt angle was 11°. The pelvic was tilted posteriorly about 6°.

(a)

(b)