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A patient-specific finite element methodology to predict damage accumulation in vertebral bodies under axial compression, sagittal flexion and combined loads

Author

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  • Yan Chevalier
  • Mathieu Charlebois
  • Dieter Pahr
  • Peter Varga
  • Paul Heini
  • Erich Schneider
  • Philippe Zysset

Abstract

Due to the inherent limitations of DXA, assessment of the biomechanical properties of vertebral bodies relies increasingly on CT-based finite element (FE) models, but these often use simplistic material behaviour and/or single loading cases. In this study, we applied a novel constitutive law for bone elasticity, plasticity and damage to FE models created from coarsened pQCT images of human vertebrae, and compared vertebral stiffness, strength and damage accumulation for axial compression, anterior flexion and a combination of these two cases. FE axial stiffness and strength correlated with experiments and were linearly related to flexion properties. In all loading modes, damage localised preferentially in the trabecular compartment. Damage for the combined loading was higher than cumulated damage produced by individual compression and flexion. In conclusion, this FE method predicts stiffness and strength of vertebral bodies from CT images with clinical resolution and provides insight into damage accumulation in various loading modes.

Suggested Citation

  • Yan Chevalier & Mathieu Charlebois & Dieter Pahr & Peter Varga & Paul Heini & Erich Schneider & Philippe Zysset, 2008. "A patient-specific finite element methodology to predict damage accumulation in vertebral bodies under axial compression, sagittal flexion and combined loads," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 11(5), pages 477-487.
    • Handle: RePEc:taf:gcmbxx:v:11:y:2008:i:5:p:477-487
    DOI: 10.1080/10255840802078022
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    Cited by:

    1. Y. Chevalier & P.K. Zysset, 2009. "A patient-specific CT-based finite element methodology to calculate the 6D stiffness matrix of vertebral bodies," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 12(S1), pages 77-79.
    2. Francisco Sahli & Jorge Cuellar & Alfonso Pérez & Aaron J. Fields & Mauricio Campos & Jorge Ramos-Grez, 2015. "Structural parameters determining the strength of the porcine vertebral body affected by tumours," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 18(8), pages 890-899, June.

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