Hip osteoarthritis and risk factors in elderly Korean population

Objective: To investigate the prevalence of hip osteoarthritis (OA) in a community-based elderly Korean population and to identify its risk factors. Design: Radiographs of hip and knee were evaluated in 288 men and 386 women (age >= 65 years) that participated in the Korean Longitudinal Study on Health and Aging (KLoSHA). Minimum joint space widths (JSW), center-edge angles (CEA), and neck-shaft angles were measured on hip radiographs, and tibio-femoral angles on knee radiographs. Hip OA was defined as minimum JSW of <= 2 mrn or <= 2.5 mm. The following potential risk factors of OA were examined; demographic data, acetabular dysplasia, large CEA (>= 40 degrees) and deformities of femoral neck and knee joint. Multivariate analysis with generalized estimating equation (GEE) model was performed to exclude confounding factors. Results: When hip OA was defined as JSW <= 2 mm, the overall prevalence of the disease was 2.1% (95% confidence interval [CI], 1.0-3.2%), and only older age (>= 70 years) was identified as a significant risk factors with an odds ratio (OR) of 10.0. However, when hip OA was defined as a JSW of <= 2.5 mm, the overall prevalence of the disease was 13.1% (95% Cl, 10.5-15.6%), and older age (>= 70 years), female, large CEA (>= 40 degrees), and acetabular dysplasia (CEA <20 degrees) were identified as significant risk factors with ORs of 2.1, 2.1, 2.3, and 10.2, respectively. Conclusions: The prevalence of hip OA in elderly Korean was 2.1% (JSW <= 2 mm) in community-based population. Older age ( :70 years), female, large CEA (>= 40 degrees), and acetabular dysplasia (CEA <20 degrees) appeared to be significant risk factors of hip OA. (C) 2009 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.