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Technical Briefs

On the Poisson's Ratio of the Nucleus Pulposus

[+] Author and Article Information
M. D. Farrell

e-mail: mark.farrell@strath.ac.uk

P. E. Riches

e-mail: philip.riches@strath.ac.uk
Department of Biomedical Engineering,
Wolfson Centre,
University of Strathclyde,
106 Rottenrow East,
Glasgow G4 ONW, UK

1Corresponding author.

Contributed by the Bioengineering Division of ASME for publication in the Journal of Biomechanical Engineering. Manuscript received April 9, 2013; final manuscript received July 25, 2013; accepted manuscript posted May 8, 2013; published online September 13, 2013. Assoc. Editor: James C. Iatridis.

J Biomech Eng 135(10), 104501 (Sep 13, 2013) (4 pages) Paper No: BIO-13-1180; doi: 10.1115/1.4025180 History: Received April 09, 2013; Revised July 25, 2013; Accepted July 28, 2013

Existing experimental data on the Poisson's ratio of nucleus pulposus (NP) tissue is limited. This study aims to determine whether the Poisson's ratio of NP tissue is strain-dependent, strain-rate-dependent, or varies with axial location in the disk. Thirty-two cylindrical plugs of bovine tail NP tissue were subjected to ramp-hold unconfined compression to 20% axial strain in 5% increments, at either 30 μm/s or 0.3 μm/s ramp speeds and the radial displacement determined using biaxial video extensometry. Following radial recoil, the true Poisson's ratio of the solid phase of NP tissue increased linearly with increasing strain and demonstrated strain-rate dependency. The latter finding suggests that the solid matrix undergoes stress relaxation during the test. For small strains, we suggest a Poisson's ratio of 0.125 to be used in biphasic models of the intervertebral disk.

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Figures

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Fig. 1

Method for positioning of tissue markers

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Fig. 2

Unconfined compression rig with biaxial video extensometer

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Fig. 3

vT  and vA variation with compressive strain and strain rate

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Fig. 4

Typical radial swelling of sample bathed in 0.15 M NaCl

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