Wear of the polyethylene tibial components in total knee replacements remains a limiting factor of implant life. Studies have used coordinate measuring machines (CMM) to estimate volumetric wear in retrieved components. This technique requires knowledge of the original pre-worn surfaces. Pre-worn surfaces have been successfully approximated in literature by nominal computer-aided design (CAD) models or, more commonly, size-matched unused inserts [1,2]. However, models and drawings of implants are proprietary, and many design parameters can have large tolerances. Unworn components are costly, often unattainable for obsolete implants and subject to deviation between batches.

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