Abstract
BACKGROUND CONTEXT: Metal-on-metal (MoM) articulations are being proposed for use in total disc replacements (TDR). The purported benefits, based upon results for THA, are a significantly lower wear rate than traditional metal-on-PE articulations. Recent wear testing of MoM TDR components has shown wear rates higher than seen for MoM THA and on the same order of magnitude of M/PE TDR's. In order to investigate these results, theoretical analyses to determine the expected lubrication regime (lambda ratio) in MoM TDR was performed. The lambda ratio is a measure of the lubrication regime the bearing will exhibit during motion. A ratio <1 indicates boundary lubrication, between 1 and 3 mixed mode lubrication, and >3 fluid film lubrication.
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