RecruitingClinical trialDuration of Immobilization After Reverse Total Arthroplasty for Proximal Humerus FracturesThe purpose of this study is to evaluate compare postoperative range of motion in patients who are given a sling for comfort only and allowed to start early active range of motion compared to patients who are placed in a sling for 4 weeks with passive range of motion only. Once enrolled, the patients will be randomized through computer randomization then placed in paper packets into either the immobilization group or the early range of motion group.