Abstract
The excessive contact stresses have been proved by many investigations for their role in the tibial insert failure. One parameter in the total knee replacement (TKR) design that influences excessive contact stresses is the average conformity. Thus, the aim of this study was to investigate the effect of the average conformity on the contact stresses in the TKR tibial insert. Ten three dimensional-finite element models with different conformity level were created. The conformity values of 0, 0.2, 0.4, 0.6, 0.7, 0.8, 0.9, 0.95, 0.99, and 1 were applied to the sagittal and frontal plane of the TKR models. The results showed that the contact pressure and the von Mises stress were decreased if the average conformity were increased, and vice versa. And, the average conformity has a larger effect on the contact pressure than on the von Mises stress. Also, from these simulations, we were informed that the developing of the contact pressure and the von Mises stress in the TKR tibial insert was greatly influenced by the average conformity. And, the von Mises stress and the contact pressure had the same trend in response to the average conformity.
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