RESUMO
A cross sectional study was conducted to investigate the relative importance of knee injury compared with obesity and sex difference in association with unilateral and bilateral osteoarthritis of the knee. The study included 212 patients suffering from osteoarthritis and attending the orthopedic outpatient clinic of El-Zahraa Hospital. The results revealed that the occurrence of bilateral osteoarthritis was more frequent than unilateral one. Bilateral osteoarthritis was strongly associated with obesity than with history of knee injury, and the reverse was observed as regard to unilateral osteoarthritis which was found to be more prevalent with patients giving history of knee injury than with obese ones. The regular exercise programs, weights control, and avoiding injury were the important recommendations