Association of mild acetabular dysplasia with an increased risk of incident hip osteoarthritis in elderly white women - The study of osteoporotic fractures

Objective. To determine if acetabular dysplasia increases the risk of incid ent hip osteoarthritis (OA) among elderly white women. Methods, Baseline and followup anteroposterior pelvic radiographs were obta ined a mean of 8 years apart, and read for individual radiographic features (IRFs) of hip OA; summary grades (0-4) were then assigned based on the IRF s present. Acetabular dysplasia,vas defined by the results of measurements of the acetabular depth (<9 mm) or the center-edge angle (<30 degrees). Log istic regression analyses were performed to determine the association betwe en acetabular dysplasia and incident hip OA, and all analyses were adjusted for age, current weight, body mass index, affected side, and investigation al site. Results. The odds ratios for the association of abnormal center-edge angle and acetabular dysplasia with incident hip OA were 3.3 (95% confidence inte rval 1.1-10.1) and 2.8 (95% confidence interval 1.0-7.9), respectively. Conclusion. Acetabular dysplasia, defined by a decrease in the center-edge angle, is associated with a modestly increased risk of incident hip OA in e lderly white women.