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Development and validation of lumbar spine finite element model

The functional biomechanics of the lumbar spine have been better understood by finite element method (FEM) simulations. However, there are still areas where the behavior of soft tissues can be better modeled or described in a different way. The purpose of this research is to develop and validate a l...

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Autores principales: Wiczenbach, Tomasz, Pachocki, Lukasz, Daszkiewicz, Karol, Łuczkiewicz, Piotr, Witkowski, Wojciech
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10424670/
https://www.ncbi.nlm.nih.gov/pubmed/37583909
http://dx.doi.org/10.7717/peerj.15805
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author Wiczenbach, Tomasz
Pachocki, Lukasz
Daszkiewicz, Karol
Łuczkiewicz, Piotr
Witkowski, Wojciech
author_facet Wiczenbach, Tomasz
Pachocki, Lukasz
Daszkiewicz, Karol
Łuczkiewicz, Piotr
Witkowski, Wojciech
author_sort Wiczenbach, Tomasz
collection PubMed
description The functional biomechanics of the lumbar spine have been better understood by finite element method (FEM) simulations. However, there are still areas where the behavior of soft tissues can be better modeled or described in a different way. The purpose of this research is to develop and validate a lumbar spine section intended for biomechanical research. A FE model of the 50th percentile adult male (AM) Total Human Model for Safety (THUMS) v6.1 was used to implement the modifications. The main modifications were to apply orthotropic material properties and nonlinear stress-strain behavior for ligaments, hyperelastic material properties for annulus fibrosus and nucleus pulposus, and the specific content of collagenous fibers in the annulus fibrosus ground substance. Additionally, a separation of the nucleus pulposus from surrounding bones and tissues was implemented. The FE model was subjected to different loading modes, in which intervertebral rotations and disc pressures were calculated. Loading modes contained different forces and moments acting on the lumbar section: axial forces (compression and tension), shear forces, pure moments, and combined loading modes of axial forces and pure moments. The obtained ranges of motion from the modified numerical model agreed with experimental data for all loading modes. Moreover, intradiscal pressure validation for the modified model presented a good agreement with the data available from the literature. This study demonstrated the modifications of the THUMS v6.1 model and validated the obtained numerical results with existing literature in the sub-injurious range. By applying the proposed changes, it is possible to better model the behavior of the human lumbar section under various loads and moments.
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spelling pubmed-104246702023-08-15 Development and validation of lumbar spine finite element model Wiczenbach, Tomasz Pachocki, Lukasz Daszkiewicz, Karol Łuczkiewicz, Piotr Witkowski, Wojciech PeerJ Computational Science The functional biomechanics of the lumbar spine have been better understood by finite element method (FEM) simulations. However, there are still areas where the behavior of soft tissues can be better modeled or described in a different way. The purpose of this research is to develop and validate a lumbar spine section intended for biomechanical research. A FE model of the 50th percentile adult male (AM) Total Human Model for Safety (THUMS) v6.1 was used to implement the modifications. The main modifications were to apply orthotropic material properties and nonlinear stress-strain behavior for ligaments, hyperelastic material properties for annulus fibrosus and nucleus pulposus, and the specific content of collagenous fibers in the annulus fibrosus ground substance. Additionally, a separation of the nucleus pulposus from surrounding bones and tissues was implemented. The FE model was subjected to different loading modes, in which intervertebral rotations and disc pressures were calculated. Loading modes contained different forces and moments acting on the lumbar section: axial forces (compression and tension), shear forces, pure moments, and combined loading modes of axial forces and pure moments. The obtained ranges of motion from the modified numerical model agreed with experimental data for all loading modes. Moreover, intradiscal pressure validation for the modified model presented a good agreement with the data available from the literature. This study demonstrated the modifications of the THUMS v6.1 model and validated the obtained numerical results with existing literature in the sub-injurious range. By applying the proposed changes, it is possible to better model the behavior of the human lumbar section under various loads and moments. PeerJ Inc. 2023-08-11 /pmc/articles/PMC10424670/ /pubmed/37583909 http://dx.doi.org/10.7717/peerj.15805 Text en ©2023 Wiczenbach et al. https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Computational Science
Wiczenbach, Tomasz
Pachocki, Lukasz
Daszkiewicz, Karol
Łuczkiewicz, Piotr
Witkowski, Wojciech
Development and validation of lumbar spine finite element model
title Development and validation of lumbar spine finite element model
title_full Development and validation of lumbar spine finite element model
title_fullStr Development and validation of lumbar spine finite element model
title_full_unstemmed Development and validation of lumbar spine finite element model
title_short Development and validation of lumbar spine finite element model
title_sort development and validation of lumbar spine finite element model
topic Computational Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10424670/
https://www.ncbi.nlm.nih.gov/pubmed/37583909
http://dx.doi.org/10.7717/peerj.15805
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