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An experimental and finite element poroelastic creep response analysis of an intervertebral hydrogel disc model in axial compression

Silva, Pujitha, Crozier, Stuart, Veidt, Martin, & Pearcy, Mark J. (2005) An experimental and finite element poroelastic creep response analysis of an intervertebral hydrogel disc model in axial compression. Journal of Materials Science: Materials in Medicine, 16(7), pp. 663-669.

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Abstract

A hydrogel intervertebral disc (IVD) model consisting of an inner nucleus core and an outer anulus ring was manufactured from 30 and 35% by weight Poly(vinyl alcohol) hydrogel (PVA-H) concentrations and subjected to axial compression in between saturated porous endplates at 200 N for 11 h, 30 min. Repeat experiments (n = 4) on different samples (N = 2) show good reproducibility of fluid loss and axial deformation. An axisymmetric nonlinear poroelastic finite element model with variable permeability was developed using commercial finite element software to compare axial deformation and predicted fluid loss with experimental data. The FE predictions indicate differential fluid loss similar to that of biological IVDs, with the nucleus losing more water than the anulus, and there is overall good agreement between experimental and finite element predicted fluid loss. The stress distribution pattern indicates important similarities with the biological IVD that includes stress transference from the nucleus to the anulus upon sustained loading and renders it suitable as a model that can be used in future studies to better understand the role of fluid and stress in biological IVDs.

Impact and interest:

18 citations in Scopus
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13 citations in Web of Science®

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ID Code: 8247
Item Type: Journal Article
Additional Information: For more information, please refer to the journal's website (see hypertext link) or contact the author. Author contact details: m.pearcy@qut.edu.au
Keywords: Intervertebral Disc, Hydrogel, Finite Element, Poroelastic, Permeability, Consolidation
DOI: 10.1007/s10856-005-2538-0
ISSN: 1573-4838
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2005 Springer
Deposited On: 26 Jun 2007
Last Modified: 29 Feb 2012 23:10

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