Finite Element Analysis of Tkr Mechanics

A 3D finite element model has been developed to study the mechanics of total knee replacements (TKRs). In particular, this study looked at the effects of certain design parameters on the stresses found in the meniscal insert component of a TKR. A primary reason for the failure of TKRs is failure of the meniscal insert. The meniscal insert is made from Ultra High Molecular Weight Polyethylene (UHMWPE) and the femoral component is commonly made from a Cobalt Chromium alloy. Failure therefore tends to occur to the meniscal insert because the femoral component is much stiffer, in the range of 100-200 times, and acts as a rigid indentor (Bartel 1985) as it articulates, rolls and slides with the meniscal insert under cyclic compressive forces.