Patients who are determined clinically to have a full thickness rotator cuff tear and who elect to have surgery will be invited to participate in this study. Informed consent will be obtained pre-operatively in the office setting. A physical examination of both shoulders will be conducted, and all patients will complete a shoulder survey in order to determine baseline values for the Simple Shoulder Test (SST), American Shoulder and Elbow Surgeons Shoulder Score (ASES), University California, Los Angeles activity score (UCLA), and Constant scores.