The advantages of arthroscopic surgery: 1. small incision, aesthetic, can avoid late irritation caused by scarring of the joint surface and sports area; 2. minimally invasive surgery, less pain, less postoperative reaction, easy to accept by patients; 3. early postoperative can move and use the limb, avoid long-term bed-rest complications, reduce nursing staff and costs; 4. relatively few complications; 5. basically does not affect the muscle structure around the joint The muscle structure around the joint is basically not affected, and functional exercises can be performed early after surgery to prevent disuse and complications caused by long-term fixation of the joint; 6. Some diseases, such as synovial crease syndrome, are established only through arthroscopy; 7.