AIM:To investigate the metaphase effect of arthroscopic debridement for osteoarthritis and discuss the indication for this arthroscopic surgery. METHODS:A retrospective analysis was made to study the clinical results of totally 124 cases of osteoarthritis after arthroscopic debridement(158 knees).All patients had at least moderate knee pain[the score of visual analogue scale (VAS) ≥4 points]and symptoms were not relieved despite systemic medical treatment for at least 3 months.The average follow up perio...