What are the special diagnostic techniques for shoulder injuries? Shoulder arthrography: It has a long history of being used for the diagnosis of rotator cuff rupture and recurrent shoulder dislocation. In recent times, due to the introduction of X-ray monitoring and video recording technology, the static images in the past have been developed into dynamic observation and analysis, which improves the diagnosis of rotator cuff lesion, shoulder developmental abnormality and shoulder joint laxity. Subacromial bursography: It is used for rotator cuff lesions, bursa lesions and X-ray radiographic measurements at different angles of projection, providing a radiological diagnosis of glenohumeral joint slippage and instability. Ultrasound, CT, MRI, etc.: Non-invasive diagnostic methods such as ultrasound, CT, and MRI are also used for the diagnosis of shoulder lesions, with clearer imaging and easier image differentiation and interpretation. The diagnosis of rotator cuff lesions, tendon, bursa and joint capsule lesions has reached a practical and mature stage (the picture shows that MRI clearly shows rotator cuff tear). Arthroscopic technique: direct microscopic observation of pathological changes in the joint capsule, glenoid labrum, glenohumeral ligament, biceps long head tendon, rotator cuff, articular cartilage and synovial membrane, and biopsy, etc. can be performed. Due to its low invasiveness, it not only expands the indications for surgical treatment of shoulder and elbow, but also improves the safety of the surgery and reduces the postoperative joint dysfunction.