Diagnostic criteria for osteoarthritis of the knee joint. 1, Recurrent knee pain within the last 1 month 2, X-ray (standing or weight-bearing position) shows narrowing of joint space, subchondral bone sclerosis and/or cystic changes, and bone redundancy formation at the joint margin. 3. clear and viscous joint fluid (at least 2 times), WBC <2000/ml 4. middle-aged and elderly patients (≥40 years old) 5. morning stiffness ≤30min 6. bone friction sound (sensation) during activity Note: comprehensive clinical, laboratory and X-ray examinations, meeting 1+2 or 1+3+5+6 or 1+4+5+6, can diagnose knee osteoarthritis. Diagnostic criteria of hip osteoarthritis. 1.Recurrent hip pain in the past 1 month 2.Blood sedimentation rate ≤ 20 mm /1 h 3.X-ray film shows bone redundancy formation and acetabular rim hyperplasia 4.X-ray film shows narrowing of hip joint space Note: If the diagnostic criteria 1+2+3 or 1+3+4 are met, osteoarthritis of the hip joint can be diagnosed.