The primary purpose of this study is to examine the influence of postoperative rehabilitation on the rate of tendon healing and clinical outcomes following arthroscopic repair of the rotator cuff. The ideal rehabilitation protocols following rotator cuff repair have yet to be determined. The clinical impact of this study will be significant in that we will better define the safety and efficacy of early mobilization of the shoulder following the surgical management of rotator cuff tears. A better understanding of appropriate postoperative physical therapy regimens is fundamental to the effective care of patients following rotator cuff repair. This study will serve as a basis for further research defining nonsurgical factors that influence tendon healing and outcome after rotator cuff repair.