A modified method for assigning material properties to FE models of bones

Benedikt Helgason, Fulvia Taddei, Halldór Pálsson, Enrico Schileo, Luca Cristofolini, Marco Viceconti, Sigurdur Brynjólfsson

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of the present study is to compare the results from subject-specific finite element analysis (FEA) of a human femur to experimental measurements, using two different methods for assigning material properties to the FE models. A modified material mapping strategy allowing for spatial variation of material properties within the elements and Young's modulus surface corrections is presented and compared to a more conventional strategy, whereby constant material properties are assigned to each element. The accuracy of the superficial stress-strain predictions was evaluated against experimental results from 13 strain gauges and five different load cases. Both methods predicted stresses with acceptable accuracy (R2 = 0.92, root mean square error, RMSE <10%), with the conventional method performing slightly better. The modified method performed better in strain prediction (R2 = 0.85, RMSE = 23% versus R2 = 0.79, RMSE = 31%).

Original languageEnglish
Pages (from-to)444-453
Number of pages10
JournalMedical Engineering and Physics
Volume30
Issue number4
DOIs
Publication statusPublished - May 2008

Keywords

  • Computed tomography
  • Experimental validation
  • Femur
  • Finite element analysis
  • Human bones
  • Material properties
  • Mesh convergence

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Psychology(all)

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