Prevalence of knee osteoarthritis in Japanese Buddhist priests.

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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.