An arthroscope is an endoscope used to diagnose and treat joint disorders. It consists of a central image acquisition rod system, a peripheral optical fiber that introduces a light source, and an outer metal protective sheath. By creating a small incision in the skin of about 0.6cmD1.2cm and inserting a thin tube with a lens at the end into the joint, the internal structure of the joint is displayed on the monitor, allowing direct observation of the intra-articular morphology and lesions and treatment of intra-articular diseases with special instruments, thus avoiding many joint incisions. This device has been used since 1970 and has been referred to as one of the three most important advances in the field of orthopedics in the 20th century, along with internal fracture fixation and artificial joint replacement. Arthroscopy is not only used for the diagnosis of disease, but has been widely used for the treatment of joint disease. Arthroscopic surgery was mainly applied to the knee joint at the beginning, but later it was applied to the hip joint, shoulder joint, ankle joint, elbow joint and so on. The advantages of arthroscopic shoulder surgery are 1. The arthroscope can see almost all parts of the joint, which is more comprehensive than cutting open the joint; 2. It is known as “putting eyes and fingers into the joint”. Contraindications 1. It is generally believed that the main contraindication is joint stiffness because it will affect the operation of arthroscopy; 2. Systemic or local infectious diseases. Severe hypertension, heart disease, diabetes mellitus, or other serious diseases where the patient cannot tolerate anesthesia and surgery. Complications Infection, thromboembolic disease, intraoperative instrument breakage, complex regional pain syndrome, injury to ligaments or even fracture or nerve injury.