• Curtis M Goreham-Voss, Rachel Vicars, Richard M Hall, and Thomas D Brown.
• Departments of Orthopaedics and Rehabilitation and Biomedical Engineering, The University of Iowa, 2181 Westlawn Building, Iowa City, IA 52246, USA. curtis-voss@uiowa.edu
• Eur Spine J. 2012 Jun 1;21 Suppl 5:S700-8.

AbstractLaboratory wear simulations of the dual-bearing surface Charité total disc replacement (TDR) are complicated by the non-specificity of the device's center of rotation (CoR). Previous studies have suggested that articulation of the Charité preferentially occurs at the superior-bearing surface, although it is not clear how sensitive this phenomenon is to lubrication conditions or CoR location. In this study, a computational wear model is used to study the articulation kinematics and wear of the Charité TDR. Implant wear was found to be insensitive to the CoR location, although seemingly non-physiologic endplate motion can result. Articulation and wear were biased significantly to the superior-bearing surface, even in the presence of significant perturbations of loading and friction. The computational wear model provides novel insight into the mechanics and wear of the Charité TDR, allowing for better interpretation of in vivo results, and giving useful insight for designing future laboratory physical tests.

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