The effect of combined loading cycles on the wear of reverse shoulder joint replacements

Wear of polyethylene is a current limitation in the long-term survival of reverse shoulder arthroplasties (RSAs). The purpose of this study was to investigate, for the first time, the influence of a combination of clinically relevant activities of daily living (ADLs) as patterns of motion and loadin...

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Bibliographic Details
Published in:Journal of the mechanical behavior of biomedical materials 2019-06, Vol.94, p.201-206
Main Authors: Ramírez-Martínez, Israel, Smith, Simon L, Joyce, Thomas J
Format: Article
Language:English
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Summary:Wear of polyethylene is a current limitation in the long-term survival of reverse shoulder arthroplasties (RSAs). The purpose of this study was to investigate, for the first time, the influence of a combination of clinically relevant activities of daily living (ADLs) as patterns of motion and loading on the wear of ultra-high molecular-weight polyethylene (UHMWPE) in RSA. This physiological combined cycle, termed "repeated-motion-load", was applied on four new samples of a commercially available reverse shoulder prosthesis for five million cycles using the unique Newcastle Shoulder Wear Simulator. This resulted in a mean wear rate of 12.0 ± 3.9 mm /million cycles for the UHMWPE components in combination with metallic glenospheres, while the average articulating UHMWPE surface roughness reduced from 692 ± 132 nm Sa to 42 ± 29 nm Sa.
ISSN:1751-6161
1878-0180
DOI:10.1016/j.jmbbm.2019.02.027