Lookup NU author(s): Dr Simon Smith,
Dr Susan Scholes,
Emeritus Professor Garth Johnson,
Professor Tom Joyce
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Reverse shoulder arthroplasty is an increasingly common surgical intervention. However there are concerns and known limitations in relation to such joint replacement, while novel designs of reverse shoulder prostheses continue to appear on the market. Many claim to offer improvements over older designs but such assertions are difficult to validate when there is no consensus as to how such implants should be tested in vitro or even if such testing is necessary. In order to permit appropriate in vitro testing of reverse shoulder prostheses a unique, multi-station test rig was designed which was capable of applying motion in three axes to test prostheses. The shoulder simulator can apply up to 110 of motion in the flexion-extension and abduction-adduction axes and up to 90 in the internal-external rotation axis. Dynamic loading of up to 1500 N can be provided. The simulator is computer controlled so that the motions and loading associated with particular activities of daily living can be applied. A 4.5 million cycle wear test of commercially available reverse shoulder prostheses was undertaken using a 'mug to mouth' activity of daily living. Gravimetric analysis was used to characterise wear. After 4.5 million cycles of 'mug to mouth', the average wear rate of the test components was 14.3 mm(3)/million cycles. Polyethylene test components showed a reduction in roughness and the median wear particle diameter was 167 nm. A three axis shoulder simulator has been designed and used to successfully test multiple samples of a commercially available reverse shoulder prosthesis. (C) 2015 Elsevier Ltd. All rights reserved.
Author(s): Smith SL, Li BL, Buniya A, Lin SH, Scholes SC, Johnson G, Joyce TJ
Publication type: Article
Publication status: Published
Journal: Journal of Biomechanics
Print publication date: 18/09/2015
Online publication date: 08/08/2015
Acceptance date: 23/07/2015
ISSN (print): 0021-9290
ISSN (electronic): 1873-2380
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