A novel approach for tetrahedral-element-based finite element simulations of anisotropic hyperelastic intervertebral disc behavior.
FE-based models
explicit time-stepping
intervertebral discs
inverse FE method
microstructural modeling
spinal segments
tetrahedral elements
Journal
Frontiers in bioengineering and biotechnology
ISSN: 2296-4185
Titre abrégé: Front Bioeng Biotechnol
Pays: Switzerland
ID NLM: 101632513
Informations de publication
Date de publication:
2022
2022
Historique:
received:
01
09
2022
accepted:
21
11
2022
entrez:
30
12
2022
pubmed:
31
12
2022
medline:
31
12
2022
Statut:
epublish
Résumé
Intervertebral discs are microstructurally complex spinal tissues that add greatly to the flexibility and mechanical strength of the human spine. Attempting to provide an adjustable basis for capturing a wide range of mechanical characteristics and to better address known challenges of numerical modeling of the disc, we present a robust finite-element-based model formulation for spinal segments in a hyperelastic framework using tetrahedral elements. We evaluate the model stability and accuracy using numerical simulations, with particular attention to the degenerated intervertebral discs and their likely skewed and narrowed geometry. To this end, 1) annulus fibrosus is modeled as a fiber-reinforced Mooney-Rivlin type solid for numerical analysis. 2) An adaptive state-variable dependent explicit time step is proposed and utilized here as a computationally efficient alternative to theoretical estimates. 3) Tetrahedral-element-based FE models for spinal segments under various loading conditions are evaluated for their use in robust numerical simulations. For flexion, extension, lateral bending, and axial rotation load cases, numerical simulations reveal that a suitable framework based on tetrahedral elements can provide greater stability and flexibility concerning geometrical meshing over commonly employed hexahedral-element-based ones for representation and study of spinal segments in various stages of degeneration.
Identifiants
pubmed: 36582835
doi: 10.3389/fbioe.2022.1034441
pii: 1034441
pmc: PMC9792499
doi:
Types de publication
Journal Article
Langues
eng
Pagination
1034441Commentaires et corrections
Type : ErratumIn
Informations de copyright
Copyright © 2022 Fasser, Kuravi, Bulla, Snedeker, Farshad and Widmer.
Déclaration de conflit d'intérêts
MB was employed by Altair Engineering GmbH. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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