The Effect of Bone Relaxation on the Simulated Pull-Off Force of a Cementless Femoral Knee Implant

Description

This presentation from the ISTA 2024 conference held in Nashville, delivered by Thomas Gersie, discusses research conducted by a group in Nijmegen regarding the influence of bone relaxation on the simulated pull-off force of cementless femoral knee implants. The study employs finite element models to assess primary fixation of these implants. Previous research indicated that existing models underestimated the micro motions between the implant and the bone, attributed to the viscoelastic properties of the bone. The presentation details the experimental setup, which involved replicating six femoral implant cases in finite element analysis using CT and micro-CT data for accurate material properties and geometries. Gersie introduces various material models—elastic, plastic, and viscoelastic—emphasizing the implications of stress relaxation on bone-implant interactions. The results indicate a reduction of pull-off forces and bone stresses when more complex material behaviors were incorporated into the models. In conclusion, the study highlights the need for further validation and suggests future research directions to better understand the implications of bone relaxation.

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