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Letters to the Editor   |    
Association of a Large Lateral Extension of the Acromion with Rotator Cuff Tears
Deepak N. Bhatia, MS(Orth), DNB(Orth); Joe F. deBeer, M Med(Orthop); Donald F. du Toit, FRCS, PhD
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The authors did not receive grants or outside funding in support of their research for or preparation of this work. They did not receive payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 2006 Aug 01;88(8):1889-1889
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Extract

To The Editor:We read with interest the article by Nyffeler et al. entitled "Association of a Large Lateral Extension of the Acromion with Rotator Cuff Tears" (2006;88:800-805). We would like to draw attention to the fact that during the natural progression of rotator cuff tears and cuff tear arthropathy, osseous changes in the glenoid and greater tuberosity can modify the radiographic "acromion index" described by the authors. Medialization of the humeral head secondary to glenoid erosion can be present with or without superior migration of the head1. This would result in a higher acromion index as a result of an increase in the glenoid plane-acromion distance, thereby erroneously suggesting a larger lateral extension of the acromion. Similarly, osteolysis, cysts, and erosion of the greater tuberosity can influence the "acromion index."2
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