Frozen shoulder is a big family Frozen shoulder, also known as periarthritis, fifty shoulder, is mostly seen in middle-aged and elderly people. The pain in the shoulder joint often radiates to the neck, back, upper arm, forearm or hand, affecting the shoulder joint activities and causing inconvenience in daily life such as putting on and taking off clothes and combing hair. It is often triggered by trauma, cold, strain, or a certain disease such as prolonged recumbency or shoulder inactivity. For patients with shoulder joint pain, conservative treatments such as functional exercise, medication, plasters, physical therapy, acupuncture, cupping, etc. are generally used, but many patients do not have good results. With the rapid development of medical science and technology, research on the etiology of frozen shoulder has made great progress, and the concept of frozen shoulder, which used to be vague, is becoming clearer and clearer. It is now believed that frozen shoulder includes at least the following eight diseases: (1) Frozen shoulder in the narrow sense, i.e. adhesive capsulitis. (2) Instability of the shoulder joint. (3) Shoulder impingement. (4) Subacromial bursitis. (5) Calcific supraspinatus tendonitis. (6)Rotator cuff injury. (7) Intra-articular free body. (8) Dizzy biceps long head tendonitis, etc. Therefore, it can be said that frozen shoulder is a big family. If we compare frozen shoulder in a broad sense in the past to a fruit basket, then the fruit basket contains the above-mentioned “apples”, “pears”, “grapes” and other specific fruits of different shapes and tastes. Based on this new understanding of frozen shoulder, patients with shoulder pain should not just observe and wait for conservative treatment, but should undergo a comprehensive and detailed examination, and treat the cause as soon as possible to prevent joint stiffness and lifelong disability. For example, the shoulder impingement syndrome, which mostly occurs in middle-aged and elderly people, is caused by local osteophytes, combined with trauma and inflammation, and soft tissue hypertrophy under the shoulder peak causing impingement. In recent years, arthroscopy has developed rapidly in the field of orthopedics. Arthroscopy can be used to treat a variety of joint disorders, such as knee, shoulder, ankle, wrist, elbow arthritis, etc., and can reduce joint adhesions; especially in the treatment of synovitis and other diseases, the original “invisible, inaccessible” embarrassing situation, the doctor can see clearly, effective treatment. In addition, arthroscopy greatly improves the accuracy of the diagnosis of intra-articular injuries and diseases. If a lesion is found, surgery can be performed immediately without having to prepare and treat it again. It is truly a case of getting twice the result with half the effort and killing two birds with one stone. Arthroscopic surgery has a small trauma port, less patient pain and faster functional recovery. Most of the shoulder diseases can be operated under shoulder arthroscopy.