Aim To investigate the relationship between the levels of nitric oxide(NO) and its inducible synthase(iNOS) in sera and joint fluids of patients with osteoarthritis (OA) and the activity of the disease.Methods The levels of NO, iNOS, erythrocyte sedimentation rate (ESR) and C reactive protein (CRP) in sera and joint fluids of 30 patients with mild, moderate or severe OA respectively and 24 healthy volunteers were measured.Results ① The levels of NO and iNOS in sera and joint fluids of patients with moder...