Objective To observe the incidence rate, related risk factors for knee primary osteoarthritis in the elderly in the urban and rural of Changxindian district of Beijing. Methods The 1507 people aged 60 years and over living in Changxindian area for a long time were investigated from June 2006 to March 2008. The unified questionnaire, including general state of health, present history,past history, physical examination etc, was carried out and all subjects were given normotopia and lateral position radiographic examination in both knees. After exclusions of other etiological factors, some of them were finally diagnosed as idiopathic osteoarthritis of knee if they had clinical symptoms and a radiographic grade above Kellgren & Lawrence Ⅱ grade. The underling influence factors were explored by means of multiple stepwise regression analysis. Results Totally, 851 objects were investigated in this study (266 men and 585 women) with the average age of 67. 9 years. The average morbidity rate was 38. 1% (male 25.6%and female 43.9%) and higher along with the increase of age and BMI. People living in cold-moist circumstance had a higher rate. Conclusions Age, female,obesity and cold-moist circumstance are the risk factors of knee osteoarthritis.%目的 研究丰台区长辛店地区老年人膝原发性关节炎患病率及相关的影响因素,为防治膝骨关节炎提供科学依据.方法 2008年6月至2009年3月调查长辛店城乡部分地区长期居住、具有本地户口、年龄在60岁以上的居民1507名.全部采取问卷调查、骨科基本查体和双膝关节的正侧位X线片检查方式进行,根据问卷内容确实有临床症状,且放射学X射线片显示Kellgren & Lawrence分级≥Ⅱ级的,排除继发性骨关节炎后,可以确诊膝原发性骨关节炎.采用多元逐步回归分析方法分析老年人膝骨关节炎的影响因素.结果 总患病率为38.1%,男性25.6%,女性43.9%;随年龄增长患病率增加;体质指数≥25 kg/m2,患病率明显增高;寒冷潮湿环境中患病率升高.结论 女性、年龄、体质指数及寒冷潮湿环境是老年人膝骨关节炎的主要影响因素.
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