In fact, this is a misconception. The term “fifty shoulders” comes from Japanese and refers to shoulder pain and limited movement after middle age; the term “fifty shoulders” is found in English textbooks or literature, which corresponds to the clinical medical concept of “adhesive capsulitis In English textbooks or literature, the term “fifty shoulder” corresponds to the clinical concept of “adhesive capsulitis”, or “frozen shoulder”, which means that the angle of movement of the shoulder joint is limited in all directions. Under normal circumstances, the arm should be able to lift up to touch the ear and back to touch the opposite scapula. It can occur at any age, not only in people over 50 years old. In fact, there are many causes of shoulder pain and limited movement. 75% of outpatients are suffering from subacromial impingement combined with bursitis and/or rotator cuff injury; 10-15% are suffering from frozen shoulder, which is what most patients think of as “50 shoulder”. Others are rheumatoid arthritis or degenerative osteoarthritis. Among the “fifty shoulders”, the one that causes more problems for patients is the frozen shoulder. The diagnosis of a frozen shoulder is not difficult. An experienced physician will only need to gently and skillfully move the patient’s shoulder to feel that the range of motion of the shoulder is significantly limited in all directions, and then use MRI or arthrography to rule out other causes. The pathology of frozen shoulder is a tight adhesion of the shoulder capsule to the humeral head and contracture of the rostral-intertrochanteric ligament. Patients with shoulder pain and limited motion should seek medical attention as soon as possible and let a professional shoulder physician analyze the specific cause of the shoulder pain and limited motion. In recent years, the understanding of the causative mechanism of the “50 shoulder” (shoulder pain and limitation of motion), combined with advances in surgical techniques and pain management, has made it possible to treat almost all of the different “50 shoulders”.