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A hyperelastic biphasic fibre-reinforced model of articular cartilage considering distributed collagen fibre orientations: continuum basis, computational aspects and applications
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.). Institute of Biomechanics, Center of Biomedical Engineering, Graz University of Technology.
2013 (English)In: Computer Methods in Biomechanics and Biomedical Engineering, ISSN 1025-5842, Vol. 16, no 12, 1344-1361 p.Article in journal (Refereed) Published
Abstract [en]

Cartilage is a multi-phase material composed of fluid and electrolytes (68-85% by wet weight), proteoglycans (5-10% by wet weight), chondrocytes, collagen fibres and other glycoproteins. The solid phase constitutes an isotropic proteoglycan gel and a fibre network of predominantly type II collagen, which provides tensile strength and mechanical stiffness. The same two components control diffusion of the fluid phase, e.g. as visualised by diffusion tensor MRI: (i) the proteoglycan gel (giving a baseline isotropic diffusivity) and (ii) the highly anisotropic collagenous fibre network. We propose a new constitutive model and finite element implementation that focus on the essential load-bearing morphology: an incompressible, poroelastic solid matrix reinforced by an inhomogeneous, dispersed fibre fabric, which is saturated with an incompressible fluid residing in strain-dependent pores of the collagen-proteoglycan solid matrix. The inhomogeneous, dispersed fibre fabric of the solid further influences the fluid permeability, as well as an intrafibrillar portion that cannot be squeezed out' from the tissue. Using representative numerical examples on the mechanical response of cartilage, we reproduce several features that have been demonstrated experimentally in the cartilage mechanics literature.

Place, publisher, year, edition, pages
2013. Vol. 16, no 12, 1344-1361 p.
Keyword [en]
cartilage, constitutive modelling, finite element simulation, collagen fibre, biphasic, homogenisation
National Category
Bioinformatics (Computational Biology)
URN: urn:nbn:se:kth:diva-134555DOI: 10.1080/10255842.2012.670854ISI: 000326351000010ScopusID: 2-s2.0-84877308884OAI: diva2:667070

QC 20131125

Available from: 2013-11-25 Created: 2013-11-25 Last updated: 2013-11-25Bibliographically approved

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Holzapfel, Gerhard A.
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Solid Mechanics (Dept.)
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