A Prospective, Double-Blind, Randomized Clinical Trial Comparing Subacromial Injection of Betamethasone and Xylocaine to Xylocaine alone in Chronic Rotator Cuff Tendinosis

BACKGROUND: Rotator cuff tendinosis is a common problem with significant health and economic effects. Nonoperative management includes the widespread use of subacromial steroid injections despite the lack of evidence of its efficacy. HYPOTHESIS: A subacromial injection of betamethasone will be more effective than xylocaine alone in improving the quality of life, impingement sign, and range of motion in patients who have chronic rotator cuff …