Objectives. The aim of this cross-sectional survey of 2232 women and 1336 men (age range 20-91 yr) was to investigate individual risk factors for hip joint osteoarthritis (OA). Methods. Standardized, weight-bearing pelvic radiographs were evaluated. Radiological hip joint OA was defined as minimum joint space width (JSW) 2.0 mm. Hip dysplasia was evaluated according to common radiographic indices. Radiographic findings were correlated to general health and lifestyle information obtained at

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... ine examinations and questionnaires. The study focused on age; self-reported hip pain, occupational exposure to repeated daily lifting, body mass index, smoking and hip dysplasia. Results. Hip dysplasia (HD) prevalence ranged from 5.4-12.8% depending on the radiographic index applied. Hip OA prevalence was 1.0-2.5% in subjects <60 yr of age and 4.4-5.3% in subjects !60 yr of age. Of factors entered into logistic regression analyses, only age (P<0.001 for right hips and P<0.001 for left hips) and hip dysplasia (P<0.001 for right hips and P ¼ 0.004 for left hips) were significantly associated with hip OA prevalence in women. In men, only hip dysplasia was associated with hip OA prevalence, P<0.001 in right hips and P ¼ 0.001 in left hips. Conclusions. Of the individual risk factors investigated in this study, only age and hip dysplasia were associated with the development of hip osteoarthritis.