The Influence of Arthroscopic Subscapularis Tendon and Capsule Release on Internal Rotation Strength in Treatment of Frozen Shoulder

BackgroundArthroscopic release of the capsule is a popular treatment option for chronic refractory frozen shoulder. Additional release of the intra-articular part of the subscapularis is controversial regarding possible impairment of subscapularis function.HypothesisArthroscopic release of the intra-articular part of the subscapularis produces good clinical results and does not lead to reduced internal rotation strength.Study DesignCase series; Level of evidence, 4.MethodsTwenty-two patients were retrospectively evaluated 53 months (range, 12–106) after undergoing arthroscopic anterior capsular release, including release of the intra-articular portion of the subscapularis. Clinical outcome was evaluated using the American Shoulder and Elbow Surgeons score and the Constant score. Isometric and isokinetic strength for internal and external rotation were determined at the time of follow-up in both shoulders using a Cybex dynamometer.ResultsThe Constant score was improved significantly from 17.7 points to 82....