Prediction of stresses and strains for orthopaedic total joint replacement components depends upon accurate knowledge of the true stress-strain behavior for ultra-high molecular weight polyethylene (hereafter polyethylene), which has been investigated in uniaxial tension but not yet in uniaxial compression. Previous research has suggested that the maximum strains in tibial components are less than 0.12 [1]. An exponential model has been shown to accurately describe the tensile true stress-strain behavior of polyethylene up to 0.12 true strain [2], but no distinction has yet made between the linear elastic and nonlinear plastic regions of the true stress-strain curve.

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