Document Type

Article

Publication Date

2009

Abstract

Loosening is the primary cause of total knee arthroplasty implant failure; therefore, to investigate this failure mode, femoral knee components were implanted in vitro on three cadaveric femurs. Bone-implant finite element (FE) models were created to predict the initial fixation of the interface of each femur. Initial fixation of the femoral knee component was successfully measured with the strain-gauged implants. Specimen-specific FE models were calibrated using the in vitro strain measurements and used to assess initial fixation. Initial fixation was shown to increase with bone density. The geometry of the implant causes the distal femur to deform plastically. It also causes higher stresses in the lateral side and higher pressures on the lateral surfaces. The implementation of plasticity in the bone material model in the FE model decreased these strains and pressures considerably from a purely elastic model, which demonstrated the importance of including plasticity.

Journal

International Journal of Experimental and Computational Biomechanics

DOI

10.1504/IJECB.2009.022857

Volume

1

Issue

1

Pages

23-44

Publisher

Inder Science

Rights

Copyright © Inder Science Publishers

Comments

This is the peer-reviewed accepted manuscript. The version of record was published in International Journal of Experimental and Computational Biomechanics, 2009 Vol.1 No.1, pp.23 - 44. DOI: 10.1504/IJECB.2009.022857

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