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AlvarezCM, LitchfieldR, JackowskiD.Am J Sports Med 2005;33:255–62
Background: It is common clinical practice to inject the subacromial space with cortisone in patients suffering from rotator cuff tendinosis; however, there is lack of scientific evidence for this practice.
Research question/s: Is a subacromial injection of betamethasone more effective than xylocaine alone in improving the quality of life, impingement sign, and range of motion in patients who have chronic rotator cuff tendinosis or partial rotator cuff tears?
Methodology: Subjects: 58 patients with rotator cuff tendinosis or partial cuff tear (>30 years, symptoms >6 months, failed physical therapy 6 weeks and NSAIDs for 2 weeks, >50% improvement with the Neer impingement test).
Experimental procedure: All subjects underwent an injection into the subacromial space containing either 5 mL of 2% xylocaine (CON = 28), 4 mL of 2% xylocaine and 1 mL (6 mg) of betamethasone (CORT =
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