Arthritis of the shoulder glenohumeral joint is a growing problem in an aging population. Treatment options for glenohumeral arthritis can be grouped into three main categories: 1) shoulder replacement surgery, 2) injections (corticosteroid, hyaluronic acid and PRP) and physical therapy (PT). Surgery comes with risks and the potential for implant failure or revision over time. Therefore, it is typical for doctors to prescribe injections and/or PT before discussing surgery. Sometimes, insurance companies will require PT before considering a shoulder operation. It is unknown if PT is effective for improving function or pain with patients with glenohumeral arthritis. The aim of this study is to compare pain and functional outcomes after undergoing a 12 week PT program, at home PT exercises or delaying conservative treatment.