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Reverse anatomy shoulder replacement: comparison of two designs

Lookup NU author(s): Milad Masjedi, Professor Garth Johnson

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Abstract

The aim of this study was to use a biomechanical model of the shoulder to examine the characteristics of two concepts of reverse anatomy implant; those that preserve the natural glenohumeral centre such as the Bayley-Walker (B-W) replacement and those medializing it such as Delta. A biomechanical model of the shoulder was used to evaluate the biomechanical characteristics of these prostheses. The moment arms of the shoulder muscles were predicted for the implanted models over a wide workspace and were compared to those of natural anatomy. The deltoid muscle moment arms through almost all of the range of motion in the Delta model were greatest. As a result the shoulder joint contact force was decreased for this implant. Furthermore, although the B-W model predicted similar moment arms to natural anatomy, the contact force decreased owing to change in the joint constraints. Finally, it was concluded that the reverse anatomy can compensate for loss of rotator cuff muscles in terms of joint stability, yet the shoulder function depends on the individual's musculature.

Publication metadata

Author(s): Masjedi M, Johnson GR

Publication type: Article

Publication status: Published

Journal: Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine

Year: 2010

Volume: 224

Issue: H9

Pages: 1039-1049

Print publication date: 01/01/2010

ISSN (print): 0954-4119

ISSN (electronic): 2041-3033

Publisher: Professional Engineering Publishing Ltd.

URL: http://dx.doi.org/10.1243/09544119JEIM759

DOI: 10.1243/09544119JEIM759

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