Arthroscopic surgery cannot simply be described as treating which symptoms, it should be treating symptoms caused by a certain disease. It can be used to diagnose and treat a variety of joint (such as knee, shoulder, ankle, hip, elbow, wrist, etc.) diseases, such as meniscus injury, frozen shoulder, joint ligament injury and chondromalacia patella. 1. Meniscus injury: mainly manifested as pain, joint swelling, abnormal popping sound during activities, decreased muscle strength and joint interlocking. The meniscus can be resected, trimmed, sutured, fixed and reconstructed under arthroscope to achieve the purpose of treatment. 2. Frozen shoulder: It is mainly characterized by pain around the shoulder joint and limitation of activities, which can be manifested as stiffness of local joints and inability to raise the arm. Shoulder arthroscopy can be used to loosen the adhesive fibers and improve the function of the joint. 3. Joint ligament injury: It is mainly characterized by local swelling, severe limitation of joint movement, muscle atrophy, change of joint shape and pain. Arthroscopic surgery can be used to reconstruct the previously damaged ligaments and maintain the stability of the joint. 4. Chondromalacia patella: the main manifestation is patellofemoral pain of the knee joint, which is gradually aggravated, and dysfunction manifested by weakness of the knee joint and pressure pain at the edge of the patella. It can be treated by arthroscopic cleaning of diseased synovial membrane and loosening of patellar support band. In addition, arthroscopic surgery is also indicated for synovial chondromatosis, bone spurs, synovial folds, joint disorders, rotator cuff injuries, various types of intra-articular fractures, joint adhesions and limitation of movement, arthralgia and inflammation, and their related symptoms. In the presence of the above diseases, the presence of arthroscopic surgery needs to be examined by a doctor to determine whether or not to perform arthroscopic surgery.