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Influence of Specimen-Specific Trabecular Anisotropy on QCT-Based Finite Element Analyses of Lumbar Vertebra

[+] Author Affiliations
Ginu U. Unnikrishnan, Glenn D. Barest, David B. Berry, Amira I. Hussein, Elise F. Morgan

Boston University, Boston, MA

Paper No. SBC2012-80114, pp. 537-538; 2 pages
doi:10.1115/SBC2012-80114
From:
  • ASME 2012 Summer Bioengineering Conference
  • ASME 2012 Summer Bioengineering Conference, Parts A and B
  • Fajardo, Puerto Rico, USA, June 20–23, 2012
  • Conference Sponsors: Bioengineering Division
  • ISBN: 978-0-7918-4480-9
  • Copyright © 2012 by ASME

abstract

Quantitative computed tomography (QCT)-based finite element (FE) models provide better predictions of vertebral strength compared to traditional methods currently used in clinical diagnosis [1]. In QCT-based FE models, the intra- and inter-specimen variations in trabecular anisotropy are often ignored, despite evidence that the biomechanical behavior of the vertebra depends on the architecture of the vertebral trabecular bone [2]. A realistic representation of the specimen-specific, trabecular anisotropy in the FE models of vertebrae would potentially improve predictions of vertebral failure. The overall goal of this study was to evaluate the importance of incorporating specimen-specific, trabecular anisotropy for QCT-based FE predictions of vertebral stiffness and deformation patterns. The major aims of this study were (a) to compare the QCT-based FE results obtained with a constant, anisotropic, material model (the “generic-anisotropic” model) for trabecular bone to those obtained with a specimen-specific, anisotropic, material model and (b) to study the influence of degree of anisotropy (DA) on the FE predictions of vertebral stiffness.

Copyright © 2012 by ASME

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