Rachel Vicars

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The current wear-testing standard (ISO18192-1) for total disc replacement (TDR) requires only four degrees of freedom (DOF) inputs: axial load, flexion–extension, lateral bending and axial rotation. The study aim was to assess the effect of an additional DOF, anterior–posterior (AP) shear on the wear of the ProDisc-L TDR. A 5DOF simulator was used to test(More)
Total disc replacements (TDRs) in the spine have been clinically successful in the short term, but there are concerns over long-term failure due to wear, as seen in other joint replacements. Simulators have been used to investigate the wear of TDRs, but only gravimetric measurements have been used to assess material loss. Micro computer tomography (microCT)(More)
STUDY DESIGN An in vitro study of the wear rates of the CHARITÉ lumbar total disc replacement (TDR). OBJECTIVE To investigate the effect of anterior-posterior shear on the in vitro wear rates of the CHARITÉ lumbar TDR. SUMMARY OF BACKGROUND DATA Current standards prescribe only 4-degrees of freedom (DOF) inputs for evaluating the in vitro wear of TDRs,(More)
Laboratory 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(More)
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