| Humeral component retroversion in reverse total shoulder arthroplasty: a biomechanical study. | |
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MedLine Citation:
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PMID: 22036543 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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BACKGROUND: Reverse total shoulder arthroplasty offers pain relief and functional improvement for patients with rotator cuff-deficient shoulders. The purpose of this study was to determine the optimal amount of humeral retroversion for this prosthesis. MATERIALS AND METHODS: Six cadaveric shoulders underwent computed tomography (CT) imaging and were then dissected of soft tissues, except for their tendinous attachments. A reverse total shoulder arthroplasty was implanted in 0°, 20°, 30°, and 40° of retroversion, and the shoulders were mounted on a simulator to determine the muscle forces required to achieve 30° and 60° of scaption. CT images were converted into 3-dimensional models, and the amount of internal and external rotation was determined with computer modeling at various scaption angles. RESULTS: No differences were found in the forces required for 30° or 60° of scaption for any muscle, at any retroversion. With increasing retroversion, more impingement-free external rotation was obtained, with a concomitant decrease in the amount of internal rotation. Above 60°, the humerus was allowed to rotate around the glenosphere unencumbered. CONCLUSIONS: Increasing retroversion did not affect the muscle force requirements for scaption across the shoulder. Placing the humeral component in 0° to 20° of retroversion allows maximum internal rotation with the arm at the side, a movement that is required for daily activities. This limits external rotation with the arm at the side, but has no effect on external rotation with the arm elevated. |
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Authors:
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Lawrence V Gulotta; Dan Choi; Patrick Marinello; Zakary Knutson; Joseph Lipman; Timothy Wright; Frank A Cordasco; Edward V Craig; Russell F Warren |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-10-29 |
Journal Detail:
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Title: Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.] Volume: - ISSN: 1532-6500 ISO Abbreviation: - Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-10-31 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9206499 Medline TA: J Shoulder Elbow Surg Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Journal of Shoulder and Elbow Surgery Board of Trustees. Published by Mosby, Inc. All rights reserved. |
Affiliation:
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Sports Medicine and Shoulder Service, Hospital for Special Surgery, New York, NY, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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