With the advancement of science and medical technology, patients with joint diseases have a practical solution to their ailments – arthroscopic surgery. Many patients have received excellent results after arthroscopic treatment, and their joints have regained their former vitality and function. So what exactly can arthroscopy do? It can be said that in the field of joint surgery, there are only a few procedures such as joint replacement and tumor removal that arthroscopy cannot perform, and most joint injuries and diseases can be treated by arthroscopic surgery. The first is diagnostic examination of all joint diseases, followed by intra-articular free body removal, treatment of synovial lesions of various diseases, cleaning of osteoarthritis, joint debridement and irrigation of septic arthritis, removal of foci of joint tuberculosis, excision, suturing and disc cartilage shaping of knee meniscus injury, reconstruction of cruciate ligament injury, lateral patellofemoral joint lesions caused by patellar dislocation or subluxation For patellofemoral joint lesions caused by patellar subluxation or subluxation, release of the supporting band and tightening of the medial supporting band; for frozen shoulder, rotator cuff injury, recurrent shoulder dislocation and shoulder instability. In the shoulder joint, we can perform release of the carpal tunnel syndrome, resection of the anterior impingement of the ankle joint, painful arthritis of the hip joint, early to mid-stage aseptic necrosis of the femoral head, resection of the glenoid labrum and round ligament impingement of the acetabulum, etc. In addition, arthroscopic surgery is used outside the joint, such as: release of hip muscle contracture; removal of cysts in the national fossa; joint fracture repositioning, internal fixation, bone grafting; joint fusion, etc. In conclusion, arthroscopy is widely used, and the therapeutic effect is sure, and it is easy to be accepted by patients because it is less traumatic, less painful, faster recovery, and less complications. In the United States, 2 – 3 million knee surgeries are performed each year, while only 120,000 cases are performed each year in China, which shows that there are still many patients in China who need arthroscopic surgery to relieve joint diseases.