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Numerical and experimental investigations for the evaluation of the wear coefficient of reverse total shoulder prostheses

Lookup NU author(s): Professor Tom Joyce

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Abstract

In the present study, numerical and experimental wear investigations on reverse total shoulder arthroplasties (RTSAs) were combined in order to estimate specific wear coefficients, currently not available in the literature. A wear model previously developed by the authors for metal-on-plastic hip implants was adapted to RTSAs and applied in a double direction: firstly, to evaluate specific wear coefficients for RTSAs from experimental results and secondly, to predict wear distribution. In both cases, the Archard wear law (AR) and the wear law of UHMWPE (PE) were considered, assuming four different k functions. The results indicated that both the wear laws predict higher wear coefficients for RTSA with respect to hip implants, particularly the AR law, with k values higher than twofold the hip ones. Such differences can significantly affect predictive wear model results for RTSA, when non-specific wear coefficients are used. Moreover, the wear maps simulated with the two laws are markedly different, although providing the same wear volume. A higher wear depth (+51%) is obtained with the AR law, located at the dome of the cup, while with the PE law the most worn region is close to the edge. Taking advantage of the linear trend of experimental volume losses, the wear coefficients obtained with the AR law should be valid despite having neglected the geometry update in the model.

Publication metadata

Author(s): Mattei L, Ciulli E, Joyce TJ, DiPuccio F

Publication type: Article

Publication status: Published

Journal: Journal of the Mechanical Behavior of Biomedical Materials

Year: 2015

Volume: 55

Pages: 53-66

Online publication date: 17/10/2015

Acceptance date: 12/10/2015

ISSN (print): 1751-6161

ISSN (electronic): 1878-0180

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.jmbbm.2015.10.007

DOI: 10.1016/j.jmbbm.2015.10.007

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