We detected an osteoarthritis of the glenohumeral joint in a considerably severe state by arthroscopy, which could not be detected by physical examination, X-Ray and M.R.I. before operation. A 75 years old woman suffered from right shoulder pain due to no distinct causes, and had no rotator cuff tears. We found remarkable abrasion of the articular cartilage and many free bodies in the glenohumeral joint by arthroscopy. Although treatment failed without operation, she recovered completely from glenohumeral joint lesions by arthroscopic surgery. It is necessary to pay attention to such symptoms when examining aged patients with shoulder pains.
