The anulus fibrosus (AF) is a lamellar, fibrocartilaginous component of the intervertebral disc, which exhibits highly anisotropic behaviors in tension. These behaviors arise from the material’s unique collagen structure. We have investigated the use of a linear, fiber-induced anisotropic model for the AF using a quadratic strain energy density formulation with an explicit representation of the collagen fiber populations. We have proposed a representative set of intrinsic material properties using independent datasets of the AF from the literature and appropriate thermodynamic constraints. The model was validated by comparing predictions with previous experimental data for AF behavior and its dependence on fiber angle. The model predicts that compressible effects may exist for the AF, and suggests that physical effects of the equivalent “matrix,” “fiber,” “fiber–matrix,” and “fiber–fiber,” interactions may be important contributors to the mechanical behavior of the AF. [S0148-0731(00)00802-5]
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April 2000
Technical Papers
A Linear Material Model for Fiber-Induced Anisotropy of the Anulus Fibrosus
Dawn M. Elliott,
Dawn M. Elliott
Department of Biomedical Engineering, Duke University, Durham, NC 27708
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Lori A. Setton
Lori A. Setton
Department of Biomedical Engineering, Duke University, Durham, NC 27708
Search for other works by this author on:
Dawn M. Elliott
Department of Biomedical Engineering, Duke University, Durham, NC 27708
Lori A. Setton
Department of Biomedical Engineering, Duke University, Durham, NC 27708
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division September 13, 1999; revised manuscript received October 18, 1999. Associate Technical Editor: L. J. Soslowsky.
J Biomech Eng. Apr 2000, 122(2): 173-179 (7 pages)
Published Online: October 18, 1999
Article history
Received:
September 13, 1999
Revised:
October 18, 1999
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A correction has been published:
Erratum: “A Linear Material Model for Fiber-Induced Anisotropy of the Anulus Fibrosus” [ASME J. Biomech. Eng., 122, pp. 173–179]
Citation
Elliott , D. M., and Setton, L. A. (October 18, 1999). "A Linear Material Model for Fiber-Induced Anisotropy of the Anulus Fibrosus ." ASME. J Biomech Eng. April 2000; 122(2): 173–179. https://doi.org/10.1115/1.429639
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