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Initiation and Progression of Mechanical Damage in the Intervertebral Disc under Cyclic Loading using Continuum Damage Mechanics Methodology: A Finite Element Study

journal contribution
posted on 19.11.2013 by Muhammad Qasim, Raghu N Natarajan, Howard S. An, Gunnar BJ Andersson
It is difficult to study the breakdown of disc tissue over several years of exposure to bending and lifting by experimental methods. There is also no finite element model that elucidates the failure mechanism due to repetitive loading of the lumbar motion segment. The aim of this study was to refine an already validated poro-elastic finite element model of lumbar motion segment to investigate the initiation and progression of mechanical damage in the disc under simple and complex cyclic loading conditions. Continuum damage mechanics methodology was incorporated into the finite element model to track the damage accumulation in the annulus in response to the repetitive loading. The analyses showed that the damage initiated at the posterior inner annulus adjacent to the endplates and propagated outwards towards its periphery under all loading conditions simulated. The damage accumulated preferentially in the posterior region of the annulus. The analyses also showed that the disc failure is unlikely to happen with repetitive bending in the absence of compressive load. Compressive cyclic loading with low peak load magnitude also did not create the failure of the disc. The finite element model results were consistent with the experimental and clinical observations in terms of the region of failure, magnitude of applied loads and the number of load cycles survived.

Funding

NIH AR48152-02

History

Publisher Statement

NOTICE: This is the author’s version of a work that was accepted for publication in Journal of Biomechanics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Biomechanics, Vol 45, Issue 11, (2012) DOI: 10.1016/j.jbiomech.2012.05.022

Publisher

Elsevier

Language

en_US

issn

0021-9290

Issue date

01/07/2012

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