Liu Chun-mei, Xu Ling
Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing 100730, China.
Zhonghua Liu Xing Bing Xue Za Zhi. 2007 Feb;28(2):177-9.
To investigate the assosiation between squatting and the prevalence of knee osteoarthritis (OA) among elders in Beijing.
We recruited a random sample of Beijing residents age > or =60 years. Subjects answered questions on joint symptoms, and knee radiographs were obtained. Subjects were also asked to recall the average amount of time spent on squatting each day at youth (25 years or so).
Among the studied subjects, 40% of the men and 68% of the women reported squatting > or = 1 hour per day at youth. The prevalence of tibiofemoral OA increased in both men and women. Compared with subjects who squatted <30 minutes per day at youth, the multivariable-adjusted prevalence odds ratios of tibiofemoral OA were: 1.1 30-59 minutes/day for those spent on squatting, 1.0 for 60-119 minutes/day, 1.7 for 120-179 minutes/day, and 2.0 for 180 minutes/day among the men (P for trend= 0.074), while the respective odda ratios among women were 1.4, 1.3, 1.2 and 2.4 (P for trend = 0.077) but a weaker association with patellofemoral OA was found.
Prolonged squatting was a strong risk factor for tibiofemoral knee OA among elderly in Beijing.
研究北京老年人下蹲与膝关节骨关节炎（OA）患病率之间的关联。
我们随机抽取了年龄≥60岁的北京居民作为样本。受试者回答有关关节症状的问题，并拍摄膝关节X光片。还要求受试者回忆年轻时（约25岁）每天下蹲的平均时间。
在研究对象中，40%的男性和68%的女性报告年轻时每天下蹲≥1小时。男女胫股关节OA的患病率均有所增加。与年轻时每天下蹲<30分钟的受试者相比，胫股关节OA的多变量调整患病率比值比分别为：男性下蹲30 - 59分钟/天的为1.1，60 - 119分钟/天的为1.0，120 - 179分钟/天的为1.7，180分钟/天的为2.0（趋势P值 = 0.074）；而女性相应的比值比分别为1.4、1.3、1.2和2.4（趋势P值 = 0.077），但与髌股关节OA的关联较弱。
在北京老年人中，长时间下蹲是胫股关节膝OA的一个重要危险因素。
