An Epidemiological Study Of Knee Osteoarthritis In The Middle-Aged And Elderly Population In WuChuan Rural Area Inner Mongolia

Objective To estimate the prevalence of knee osteoarthritis (OA) in the Middle-Aged and Elderly Population in WuChuan Rural Area Inner Mongolia using standardized questionnaire and radiographic protocols. Compare the prevalence with that of Beijing OA Study to explore the epidemiological characteristic differences in different urban or rural areas of China, and pursue further on the etiopathogenisis and evidence of prevention and treatment for OA.Methods Local rural residents aged 50 years and above from 5 village boards by cluster sampling method were investigated by questionnaire, radiographic examination and physical examination. The ones whose radiographic examinations show K/L≥2 were diagnosis as ROA. Those who had knee symptoms for at least one month, with radiographic examinations K/L≥2, were diagnosis as SOA. Finally, we compare the survey data with that of Beijing OA Study.Results 1030 participants aged 50 years and above from 5 village boards had taken this survey, including 506 males, 524 females. The response rate was 90.2%. The total prevalence of knee OA in male and female was male 10%(ROA),7%(SOA),female 20%(ROA),14%(SOA), respectively. In the 65 years and above age group, the prevalence of severe ROA and SOA are all higher significantly than that of Beijing OA Study.Conclusions In this study, we found that the prevalence of knee OA in Wuchan rural area was higher than that of Beijing urban area, the prevalence difference of female was significant. Gender, age, menopause, body weight, the difference in urban and rural of intensity and pose in works might serve as risk factors.