Arthroscopy is a minimally invasive technique that was first applied to large joints throughout the body, and later, through the development of technology, arthroscopic treatment can be performed in large and small joints throughout the body and even in soft tissues. At present, its indications are very broad, roughly as follows: 1. The knee joint can be treated under arthroscopy for meniscal injury, anterior and posterior cruciate ligament injury, articular cartilage injury, joint stiffness loosening, osteoarthritis cleaning, various synovitis, arthritis, synovial crepitus syndrome, and synovial chondromatosis; 2. In shoulder arthroscopy, frozen shoulder, rotator cuff injury, shoulder dislocation, calcific tendonitis, subacromial impingement syndrome, biceps tendinopathy, and various synovitis of the shoulder joint can be treated; 3. In hip arthroscopy, hip impingement syndrome, hip glenoid labral injury, acetabular or femoral head cartilage injury, 4. For small joints of the extremities, the arthroscopic diagnosis and treatment of small joint lesions such as the elbow joint, ankle joint, wrist joint and even the metatarsophalangeal joint can be completed. Such as intra-articular cartilage, soft tissue or ligament injury, bony or soft tissue impingement, cartilage injury and synovitis free body.