1. Degenerative lesions of the shoulder joint can often be demonstrated radiographically before there is actual rupture of the musculo-tendinous cuff.

2. The characteristic pathological, clinical and radiographic features of degenerative lesionsare described.

3. All injuries of the shoulder joint, however trivial, occurring in patients over middle age, should be studied carefully by radiographic examination.

4. In injuries of the shoulder joint the presence of a degenerative lesion prolongs the duration of symptoms, and the prognosis is less satisfactory than when there is no radiographic evidence of abnormality.