Document Detail

Biomechanical evaluation of different designs of glenospheres in the SMR reverse total shoulder prosthesis: range of motion and risk of scapular notching.
MedLine Citation:
PMID:  19393929     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Reverse total shoulder arthroplasty is a treatment option for cuff tear arthropathy. Scapular notching remains a concern. This biomechanical study compared the range-of-motion in different designs of glenospheres and hence the relative risk of scapular notching. METHOD: A precision coordinate device was used to investigate four different designs of glenospheres (SMR prosthesis); 36 mm concentric (Standard), 36 mm eccentric, 44 mm concentric, and 44 mm eccentric glenospheres. The centre of rotation in each design was first established. The position of the humeral prosthesis was recorded in the plane of the scapula to compare the degree of adduction and the total range-of-motion. RESULTS: Eccentric glenospheres were found to improve range-of-motion by allowing a higher degree of adduction. Larger diameter glenospheres were found to improve range-of-motion by increasing adduction and abduction. Compared to the 36 mm concentric (standard) glenosphere, the 36 mm eccentric glenosphere improved adduction by 14.5 degrees, the 44 mm concentric glenosphere improved adduction by 11.6 degrees, the 44 mm eccentric glenosphere improved adduction by 17.7 degrees. CONCLUSION: Eccentric glenospheres with a center-of-rotation placed more inferiorly were shown to improve adduction. This design may reduce the clinical incidence of scapular notching.
Justin Chou; Sharif F Malak; Iain A Anderson; Tim Astley; Peter C Poon
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.]     Volume:  18     ISSN:  1532-6500     ISO Abbreviation:  J Shoulder Elbow Surg     Publication Date:    2009 May-Jun
Date Detail:
Created Date:  2009-04-27     Completed Date:  2009-07-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9206499     Medline TA:  J Shoulder Elbow Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  354-9     Citation Subset:  IM    
Department of Orthopaedic Surgery, North Shore Hospital, North Shore City, New Zealand.
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MeSH Terms
Analysis of Variance
Arthroplasty, Replacement / methods*
Computer Simulation
Joint Instability / prevention & control
Joint Prosthesis*
Prosthesis Design*
Range of Motion, Articular / physiology
Scapula / physiopathology*
Sensitivity and Specificity
Shoulder Impingement Syndrome / prevention & control
Shoulder Joint / physiopathology,  surgery*
Stress, Mechanical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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