An arthroscope is a rod-shaped optical instrument with a diameter of about 5 mm that is used as an endoscope to view the internal structure of a joint and to treat joint disorders. The arthroscope is equipped with a lens at the end of a thin tube, which is inserted into the joint, and the internal structure of the joint is displayed on a monitor. As a result, the structures inside the joint can be viewed directly. What can arthroscopic surgery do? Arthroscopic surgery is performed by cutting several “chopstick” sized or smaller holes (5-10 mm) in the skin, inserting a camera and surgical instruments into the joint, and having the surgeon operate under the supervision of a monitor to diagnose and treat various joint diseases. The joints that can be treated abroad so far include: knee, shoulder, ankle, elbow, wrist, jaw, hip, metacarpophalangeal joint, and even thoracic and lumbar vertebral joints. Arthroscopic surgery has the following advantages compared with arthroscopic surgery: 1. small incision without infection and minimal skin scar; 2. less trauma, safe surgery, repeatable surgery, does not affect the joint to do other surgeries later; 3. one arthroscopic surgery can treat a variety of diseases at the same time, such as knee surgery can be performed at the same time arthroscopy, synovial wall resection, etc.; 4. wide indications, it is applicable to the joint of A wide variety of lesions. There are few contraindications, such as poor physical conditions that prevent conventional surgery, but do not necessarily contraindicate arthroscopic surgery. Arthroscopic surgery can treat various inflammatory diseases in the joints. Such as osteoarthritis synovitis, traumatic arthritis, rheumatoid arthritis, tuberculosis arthritis, septic arthritis, exfoliative osteochondritis, etc., as well as synovial chondromatosis, patellar chondromalacia, bone redundancy (bone spur), free body, synovial wall, joint disorders, meniscal damage, joint capsule adhesions, various intra-articular fractures, joint adhesions and joint movement restrictions, and various unexplained joint pains. Arthroscopy is used to study the changes of intra-articular lesions: during the development of joint diseases, arthroscopy can be performed several times, and by taking pictures, videos or synovial biopsies, information that is difficult to obtain by other diagnostic methods can be obtained, which is extremely helpful for diagnosis, treatment and prognosis. Arthroscopy for treatment: For some lesions of the knee and shoulder joints, after a clear diagnosis of the researcher, surgery can be performed with special instruments under microscopic view, and satisfactory results can be achieved. For example, joint irrigation and debridement, partial or complete meniscectomy of torn meniscus of knee joint, suture of meniscus edge, anterior cruciate ligament repair, synovial crease excision, intra-articular adhesion release, tibial plateau or intercondylar crest fracture repair, rotator cuff debridement, biceps tendon adhesion release and intra-articular free body removal. In addition, major synovectomy is feasible for rheumatoid arthritis diseases of the large joints of the extremities. The absolute contraindication to arthroscopy is joint stiffness because it prevents the operation of arthroscopy. For those who have recently undergone arthrography, due to the possibility of secondary chemical synovitis. False-positive results can be obtained if the arthroscopy is performed within 1 week after the imaging. In patients with bleeding disorders, although intraoperative bleeding can be flushed with a large amount of saline to obtain a good field of view for diagnosis, a large amount of joint hemorrhage can occur after surgery. These two points should be paid special attention when choosing arthroscopy.