Prevalence of knee osteoarthritis in Japanese Buddhist priests.

虽然膝盖弯曲已被证明对膝骨关节炎（OA）的发展有更严重的影响，但我们并不知道直立坐姿（日本人自己的坐姿）与膝关节OA的关系。本研究以1965年至1985年间在日本滋贺县两大寺庙任职的日本佛教僧人为研究对象。作为对照，先前对当地社区举行的健康检查有反应且记录为没有坐直习惯的男性受试者。对队列和对照受试者进行病史记录和体格检查，并拍摄x线片。骨关节炎以两种不同的方式定义：满足ACR分类标准或放射学K-L评分为2级或以上的人被定义为患有膝关节OA。采用logistic回归分析计算优势比和95%置信区间。我们的研究表明，坐姿习惯与膝关节OA无显著关系。在考虑了年龄、身高、体重和膝盖创伤史等混杂因素后，分析结果基本相似。

Although knee bending has been indicated to have worse effects on developing knee osteoatrhritis (OA), we are not aware of the relation of sitting upright, a Japanese own style of sitting, with knee OA.In the present study, the Japanese Buddhist priests who acquired the position at two major temples in Shiga prefecture, Japan, between 1965 and 1985 were selected as the cohort. As control, male subjects who previously responded to the health care examination held by the local community and who were recorded as having no custum of sitting upright.History-taking and physical examination were performed and radiogrphs were taken for both cohort and control subjects. Osteoarthritis was defined in two separate manners : those satisfying the ACR classification criteria or those who had radiographic K-L score of grades 2 or more were defined as having knee OA.Odds ratio and 95% confidence interval were calculated by logistic regression analysis.Our study showed that the custom of sitting upright had no significant relation with knee OA.The results were essentially similar when the analysis was adjusted for confounders such as age, height, weigt and history of knee trauma.