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Sports Medicine and Shoulder Service
Sports Medicine and Shoulder Service
Sports Medicine and Shoulder Service
Department of Biomechanics, the Hospital for Special Surgery, New York, New York
The purpose of this study was to determine the contri butions of specific capsuloligamentous structures to restraining superior-inferior translation of the glenohu meral joint. Eleven cadaveric shoulders were tested using a four degrees-of-freedom test apparatus. The humerus was free to translate in three planes and free to flex and extend when a superior and inferior force of 50 N was applied. Testing was performed in three positions of abduction (0°, 45°, and 90°) and three positions of rotation (neutral, maximum internal, and external). Shoulders were tested intact, vented, and after division of specific capsuloligamentous structures. The primary restraint to inferior translation of the ad ducted shoulder was the superior glenohumeral liga ment. The coracohumeral ligament appeared to have no significant suspensory role. With progressive abduc tion, the anterior and posterior portions of the gleno humeral ligament become the main static stabilizers resisting inferior translation: the anterior portion was the primary capsular restraint at 45° of abduction, while the posterior portion was the primary restraint at 90° of abduction, neutral rotation.
Our results indicate that clinical assessment of glenohumeral translation in the superior-inferior plane should be performed in multiple positions of abduction and rotation.
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K. P. Speer, Xianghua Deng, P. A. Torzilli, D. A. Altchek, and R. F. Warren Strategies for an Anterior Capsular Shift of the Shoulder: A Biomechanical Comparison Am. J. Sports Med., June 1, 1995; 23(3): 264 - 269. [Abstract] [PDF]
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N. A. Sharkey and R. A. Marder The Rotator Cuff Opposes Superior Translation of the Humeral Head Am. J. Sports Med., June 1, 1995; 23(3): 270 - 275. [Abstract] [PDF]
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C. Guanche, T. Knatt, M. Solomonow, Yun Lu, and R. Baratta The Synergistic Action of the Capsule and the Shoulder Muscles Am. J. Sports Med., June 1, 1995; 23(3): 301 - 306. [Abstract] [PDF]
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L. U. Bigliani, P. R. Kurzweil, C. C. Schwartzbach, I. N. Wolfe, and E. L. Flatow Inferior Capsular Shift Procedure for Anterior-inferior Shoulder Instability in Athletes Am. J. Sports Med., September 1, 1994; 22(5): 578 - 584. [Abstract] [PDF]
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