This study analyses the results of 30 surgical repairs of the rotator cuff. The basic problem was degenerative pathology in which medical treatment had been tried previously in all cases. The type of treatment was based upon preoperative evaluation and arthro-CT scan in particular. Results were invariably good, with regression of pain and recovery of activity. Muscle power was significantly correlated with the value of the tendon repaired, this being reflected overall by incomplete recovery.