I. What conditions are suitable for knee replacement surgery? (1) Various inflammatory arthritis of knee joint, including rheumatoid arthritis, osteoarthritis, hemophilic arthritis, Charcot arthritis, etc.; (2) Few traumatic arthritis; (3) Osteoarthritis after failure of high tibial osteotomy; (4) Patellofemoral arthritis of a few elderly people; (5) Infectious arthritis of resting (including tuberculosis); (6) Few primary or secondary osteochondral necrosis diseases. Cartilage necrosis disease. What are the contraindications for knee replacement surgery? Total knee replacement is contraindicated in the following cases: (1) paralysis of the muscles around the knee joint; (2) the knee joint has been fused in a functional position for a long time without symptoms such as pain and deformity. Based on experience, severe flexion contracture deformity (greater than 60 degrees), severe osteoporosis, joint instability, severe muscle weakness, fibrous or bony fusion are not absolute contraindications to surgery.