ENLARGED ACETABULAR LABRA IN THE PIMA-INDIANS

Objective, To report the descriptive epidemiology of acetabular labral enlargement and analyze associations of other variables with this var iant. Methods, Pelvis radiographs from 761 Pima Indians aged greater t han or equal to 45 years enrolled in a population based study were rea d by Kellgren-Lawrence global and individual radiographic features gra ding scales for osteoarthritis (OA) at separate sittings. In total, 72 2 radiographs remained eligible for this study after excluding 12 unre adable radiographs and 27 cases of radiographic hip OA (Kellgren-Lawre nce grade greater than or equal to 2). Enlarged acetabular labra were recorded during readings of individual radiographic features. Results. Enlarged acetabular labra were present in 16% of study participants w ithout OA and were significantly associated with female sex, but not w ith the variables age, body mass index, clinical hip joint involvement , diabetes, or serum insulin concentrations. Conclusion. Acetabular la bral enlargement is common in the Pima Indians, and although not in ex cess of other reported acetabular margin anomalies, it differs in appe arance and is not associated with age. Recognition of this structural variant is important because it can mimic fractures or osteophytes.