Interlamellar shear may play an important role in the homeostasis and degeneration of the intervertebral disk. Accurately modeling the shear behavior of the interlamellar compartment would enhance the study of its mechanobiology. In this study, physical experiments were utilized to describe interlamellar shear and define a constitutive model, which was implemented into a finite element analysis. Ovine annulus fibrosus (AF) specimens from three locations within the intervertebral disk (lateral, outer anterior, and inner anterior) were subjected to in vitro mechanical shear testing. The local shear stress–stretch relationship was described for the lamellae and across the interlamellar layer of the AF. A hyperelastic constitutive model was defined for interlamellar and lamellar materials at each location tested. The constitutive models were incorporated into a finite element model of a block of AF, which modeled the interlamellar and lamellar layers using a continuum description. The global shear behavior of the AF was compared between the finite element model and physical experiments. The shear moduli at the initial and final regions of the stress–strain curve were greater within the lamellae than across the interlamellar layer. The difference between interlamellar and lamellar shear was greater at the outer anterior AF than at the inner anterior region. The finite element model was shown to accurately predict the global shear behavior or the AF. Future studies incorporating finite element analysis of the interlamellar compartment may be useful for predicting its physiological mechanical behavior to inform the study of its mechanobiology.
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Research-Article
A Computational Model to Describe the Regional Interlamellar Shear of the Annulus Fibrosus
Kevin M. Labus,
Kevin M. Labus
School of Biomedical Engineering,
Colorado State University
,Fort Collins, CO 80523-1374
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Sang Kuy Han,
Sang Kuy Han
Fischell Department of Bioengineering,
University of Maryland
,College Park, MD 20742
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Adam H. Hsieh,
Adam H. Hsieh
Fischell Department of Bioengineering,
University of Maryland
,College Park, MD 20742
;Department of Orthopaedics,
School of Medicine,
School of Medicine,
University of Maryland
,Baltimore, MD 21201
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Christian M. Puttlitz
Christian M. Puttlitz
1
Associate Professor
Orthopaedic Research Center,
Department of Mechanical Engineering,
1374 Campus Delivery,
Fort Collins, CO 80523-1374
e-mail: puttlitz@engr.colostate.edu
Orthopaedic Research Center,
Department of Mechanical Engineering,
Colorado State University
,1374 Campus Delivery,
Fort Collins, CO 80523-1374
e-mail: puttlitz@engr.colostate.edu
1Corresponding author.
Search for other works by this author on:
Kevin M. Labus
School of Biomedical Engineering,
Colorado State University
,Fort Collins, CO 80523-1374
Sang Kuy Han
Fischell Department of Bioengineering,
University of Maryland
,College Park, MD 20742
Adam H. Hsieh
Fischell Department of Bioengineering,
University of Maryland
,College Park, MD 20742
;Department of Orthopaedics,
School of Medicine,
School of Medicine,
University of Maryland
,Baltimore, MD 21201
Christian M. Puttlitz
Associate Professor
Orthopaedic Research Center,
Department of Mechanical Engineering,
1374 Campus Delivery,
Fort Collins, CO 80523-1374
e-mail: puttlitz@engr.colostate.edu
Orthopaedic Research Center,
Department of Mechanical Engineering,
Colorado State University
,1374 Campus Delivery,
Fort Collins, CO 80523-1374
e-mail: puttlitz@engr.colostate.edu
1Corresponding author.
Contributed by the Bioengineering Division of ASME for publication in the Journal of Biomechanical Engineering. Manuscript received October 16, 2013; final manuscript received February 3, 2014; accepted manuscript posted March 6, 2014; published online April 10, 2014. Assoc. Editor: James C. Iatridis.
J Biomech Eng. May 2014, 136(5): 051009 (7 pages)
Published Online: April 10, 2014
Article history
Received:
October 16, 2013
Revision Received:
February 3, 2014
Accepted:
March 6, 2014
Citation
Labus, K. M., Han, S. K., Hsieh, A. H., and Puttlitz, C. M. (April 10, 2014). "A Computational Model to Describe the Regional Interlamellar Shear of the Annulus Fibrosus." ASME. J Biomech Eng. May 2014; 136(5): 051009. https://doi.org/10.1115/1.4027061
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