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A Validated Open-Source Multisolver Fourth-Generation Composite Femur Model.

Alisdair R MacLeod1, Hannah Rose1, Harinderjit S Gill1

  • 1Centre for Biomechanics, Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK

Journal of Biomechanical Engineering
|September 13, 2016
PubMed
Summary
This summary is machine-generated.

This study compares three finite-element (FE) solvers for biomechanical analysis, finding excellent agreement. It also provides validated, open-source FE models of composite femurs, crucial for implant research.

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Area of Science:

  • Biomechanics and Biomaterials Engineering
  • Computational Mechanics
  • Orthopaedic Biomechanics

Background:

  • Synthetic biomechanical test specimens are vital for preclinical implant evaluation, often coupled with finite-element (FE) analysis.
  • Popular FE packages include Abaqus, Ansys, and Febio, yet no comparative study exists.
  • Validated, open-source FE models of the femur, a critical bone, are currently unavailable.

Purpose of the Study:

  • Compare mesh convergence and strain prediction accuracy across Abaqus, Ansys, and Febio FE solvers.
  • Develop and validate open-source FE models of composite femurs for use with these three solvers.
  • Assess geometric variability in the femoral neck region of composite femurs.

Main Methods:

  • Experimental testing of instrumented fourth-generation composite femurs.
  • Creation of generic and specimen-specific FE models from CT scans.
  • Comparison of strain predictions from Abaqus, Ansys, and Febio solvers against experimental data.

Main Results:

  • All three FE solvers demonstrated excellent agreement in strain prediction (r² > 0.99).
  • Specimen-specific FE models showed significantly higher accuracy (RMSE 13.8%) compared to generic models (RMSE 134.5%).
  • Composite femurs exhibited substantial cortical thickness variations (up to 48.4%) in the femoral neck region.

Conclusions:

  • The study validates the accuracy of Abaqus, Ansys, and Febio for biomechanical FE analysis.
  • Validated, open-source FE models of the composite femur are now available for multiple FE packages.
  • The findings highlight the importance of specimen-specific modeling and underscore geometric variability in composite femurs.