One of the primary concerns following repair of the rotator cuff is healing of the repaired tendon. Although pain relief and improved shoulder function are predictable following rotator cuff repair, the rate of healing of the tendon repair has been much less consistent. In most instances, the repaired tissue is degenerative, 4, 5 possesses a poor blood supply 6 and, therefore, a limited ability to heal following repair. The rates of healing of the repaired cuff tendons have ranged from 6% to 80% across multiple studies depending on a variety of patient, tendon tear and surgery related factors 7-13. The major factors that have been identified to effect healing after rotator cuff repair include patient age, the size of the tear and the strength of the repair construct 8, 9, 12. To this point, there has been little data regarding the potential influence of postoperative rehabilitation of the shoulder on the structural integrity of rotator cuff repairs.