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In Vivo Determination of the Dynamics of Normal, Rotator Cuff-Deficient, Total, and Reverse Replacement Shoulders
Mohamed Mahfouz, PHD; Gregory Nicholson, MD; Richard Komistek, PHD; David Hovis, MD; Matthew Kubo, BS
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In support of their research or preparation of this manuscript, one or more of the authors received grants or outside funding from Zimmer. In addition, one or more of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity (Zimmer). 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, 2005 Dec 01;87(suppl 2):107-113. doi: 10.2106/JBJS.E.00483
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Extract

Patients with osteoarthritis of the shoulder experience pain and decreased range of motion, which compel them to seek care. The vast majority of osteoarthritic shoulders have an intact rotator cuff. However, the rotator cuff may function poorly because of osseous deformity and soft-tissue contracture. Total shoulder arthroplasty has proved to be a reliable procedure for pain relief and improved function1-5. The ultimate functionality of the arthroplasty depends on multiple factors, including alignment of the prosthetic implant, rotator cuff muscle belly health, soft-tissue balance achieved at the time of surgery, and patient compliance with rehabilitation3-6.
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    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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