Since the world’s first arthroscopic device was introduced, it has been more than 50 years of history. Ankle joint disorders are very common in clinic, general sprains can be cured by conservative treatment, but some patients’ ankle joint swelling and pain can persist for a long time, and cannot be clearly diagnosed by physical and imaging examinations. Arthroscopic technology can make up for this defect and realize the internal structural changes of the ankle joint under direct vision, which can help physicians to make more accurate judgments than before, so as to actively deal with the cause of the disease. Indications: 1. Diagnostic arthroscopy: including unexplained chronic pain in the ankle joint for more than 3 months, ineffective conservative treatment; acute ligament injury; ankle joint instability; synovial tissue lesions; cartilage injury; intra-articular fracture accompanied by cartilage injury. 2.Therapeutic arthroscopy: including ankle joint instability, rheumatoid arthritis; ankle synovitis; intra-articular fracture, osteochondrosis; arthrofibroplastic lesions after trauma or surgery; ankle impingement syndrome; intra-articular free body or osteoclasts; joint capsule contracture and so on. Technical features: 1, small trauma: with the endoscope with a diameter of only 1.7-4.0mm, it enters into the joint cavity by a small incision of 5mm on the skin, which is one-tenth of the conventional ordinary traditional surgery. 2.Safety: through the color high-definition television monitoring system intuitive, clear, comprehensive observation of various intra-articular structural changes, placement of special surgical instruments, under the supervision of arthroscopy, resection of diseased tissues, trimming, gasification, suture, fixation and other microscopic surgery, and can dynamically observe the degree of influence of abnormal tissues on the stability of the joints and the function of the joints, and, if necessary, can be appropriate to retain the lesion biopsy, so that the diagnosis is more clear, reliable and complete. This makes the diagnosis more clear, reliable and complete, which is conducive to the physician to choose the best treatment plan for the patient. 3, fast: fast recovery, minimally invasive treatment can be a day to go down to the ground activities. 4.It is not easy to recur after cure: minimally invasive ankle arthroscopy treatment is extremely traumatic, eliminating the problem of postoperative adhesion, and it is not easy to recur after cure.