An experimental and finite element poroelastic creep response analysis of an intervertebral hydrogel disc model in axial compression
(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.
| Item Type: | Journal Article |
|---|---|
| Status: | Published |
| Keywords: | Intervertebral Disc, Hydrogel, Finite Element, Poroelastic, Permeability, Consolidation |
| Subjects: | 290000 Engineering and Technology > 291500 Biomedical Engineering > 291504 Biomechanical Engineering |
| ID Code: | 8247 |
| Deposited By: | Pearcy, Mark |
| Deposited On: | 26 June 2007 |
| Alternative Locations: | http://dx.doi.org/10.1007/s10856-005-2538-0 |
| Copyright Owner: | Copyright 2005 Springer |
| 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 |