Finite element modeling of resurfacing hip prosthesis: Estimation of accuracy through experimental validation

Fulvia Taddei, Saulo Martelli, Harinderjit Singh Gill, Luca Cristofolini, Marco Viceconti

Research output: Contribution to journalArticle

Abstract

Metal-on-metal hip resurfacing is becoming increasingly popular, and a number of new devices have been recently introduced that, in the short term, appear to have satisfactory outcome but many questions are still open on the biomechanics of the resurfaced femur. This could be investigated by means of finite element analysis, but, in order to be effective in discerning potential critical conditions, the accuracy of the models' predictions should be assessed. The major goal of this study was to validate, through a combined experimental-numerical study, a finite element modeling procedure for the simulation of resurfaced femurs. In addition, a preliminary biomechanical analysis of the changes induced in the femoral neck biomechanics by the presence of the device was performed, under a physiologic range of hip joint reaction directions. For this purpose, in vitro tests and a finite element model based on the same specimen were developed using a cadaver femur. The study focused on the Conserve Plus, one of the most common contemporary resurfacing designs. Five loading configurations were identified to correspond to the extremes of physiological directions for the hip joint. The agreement between experimental measurements and numerical predictions was good both in the prediction of the femoral strains (R2>0.9), and in the prosthesis micromotions (error

Original languageEnglish
JournalJournal of Biomechanical Engineering
Volume132
Issue number2
DOIs
Publication statusPublished - Feb 2010

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Keywords

  • Biomechanics
  • Epiphyseal prosthesis
  • Finite element model
  • In vitro simulation
  • Micromotions
  • Validation

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physiology (medical)

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