Prevalence and risk factors of knee osteoarthritis in Huang-Pu District, Shanghai, China

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Abstract
A community-based survey on the prevalence of knee osteoarthritis (OA) and associated factors was carried out in Shanghai, People’s Republic of China. Of 2,305 registered residents ≥40 years of age, 2,093 were examined by interview and questionnaire. One hundred ninety knee pain-positive and 510 knee pain-negative subjects received radiography. Radiographic knee OA (RKOA) was found in 72.1% (137/190) of symptomatic and 41.6% (212/510) of asymptomatic subjects (SKOA and AsKOA, respectively). The estimated prevalences of symptomatic and asymptomatic knee OA in the community were 7.2% and 37.4%, respectively. Women had higher SKOA prevalence than men (9.8% vs 3.7%, P P<0.01). The prevalence of SKOA increased with age, from 1.3% in the 40–49-year-old age group to 13.2% in the 70+ group. Age, body mass index, and female gender were associated risk factors for knee OA.