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  • Title: Prevalence and risk factors of knee osteoarthritis in Huang-Pu District, Shanghai, China.
    Author: Du H, Chen SL, Bao CD, Wang XD, Lu Y, Gu YY, Xu JR, Chai WM, Chen J, Nakamura H, Nishioka K.
    Journal: Rheumatol Int; 2005 Oct; 25(8):585-90. PubMed ID: 15309503.
    Abstract:
    OBJECTIVES: A community-based survey on the prevalence of knee osteoarthritis (OA) and associated factors was carried out in Shanghai, People's Republic of China. METHODS: Of 2,305 registered residents >or=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. RESULTS: 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<0.01). Compared with Caucasians, the urban Shanghai population had a higher prevalence of tibiofemoral joint OA. CONCLUSIONS: There was a higher proportion of SKOA than AsKOA (72.1% vs 41.6%), and SKOA was significantly more associated with disability (81.0% vs 26.9%, 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.
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