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dc.contributor.authorKhayyeri, Hanifeh
dc.contributor.authorGustafsson, Anna
dc.contributor.authorHeuijerjans, Ashley
dc.contributor.authorMatikainen, Marko K.
dc.contributor.authorMarko K., Petro
dc.contributor.authorEliasson, Pernilla
dc.contributor.authorAspenberg, Per
dc.contributor.authorIsaksson, Hanna
dc.date.accessioned2016-06-13T11:33:39Z
dc.date.available2016-06-13T11:33:39Z
dc.date.issued2015-06-01
dc.identifier10.1371/journal.pone.0126869
dc.identifier.citationKhayyeri H, Gustafsson A, Heuijerjans A, Matikainen MK, Julkunen P, Eliasson P, et al. (2015) A Fibre-Reinforced Poroviscoelastic Model Accurately Describes the Biomechanical Behaviour of the Rat Achilles Tendon. PLoS ONE 10(6): e0126869. doi:10.1371/journal.pone.0126869fi_FI
dc.identifier.issn1932-6203
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/65
dc.descriptionArticle
dc.description.abstractBackground Computational models of Achilles tendons can help understanding how healthy tendons are affected by repetitive loading and how the different tissue constituents contribute to the tendon’s biomechanical response. However, available models of Achilles tendon are limited in their description of the hierarchical multi-structural composition of the tissue. This study hypothesised that a poroviscoelastic fibre-reinforced model, previously successful in capturing cartilage biomechanical behaviour, can depict the biomechanical behaviour of the rat Achilles tendon found experimentally. Materials and Methods We developed a new material model of the Achilles tendon, which considers the tendon’s main constituents namely: water, proteoglycan matrix and collagen fibres. A hyperelastic formulation of the proteoglycan matrix enabled computations of large deformations of the tendon, and collagen fibres were modelled as viscoelastic. Specimen-specific finite element models were created of 9 rat Achilles tendons from an animal experiment and simulations were carried out following a repetitive tensile loading protocol. The material model parameters were calibrated against data from the rats by minimising the root mean squared error (RMS) between experimental force data and model output. Results and Conclusions All specimen models were successfully fitted to experimental data with high accuracy (RMS 0.42-1.02). Additional simulations predicted more compliant and soft tendon behaviour at reduced strain-rates compared to higher strain-rates that produce a stiff and brittle tendon response. Stress-relaxation simulations exhibited strain-dependent stress-relaxation behaviour where larger strains produced slower relaxation rates compared to smaller strain levels. Our simulations showed that the collagen fibres in the Achilles tendon are the main load-bearing component during tensile loading, where the orientation of the collagen fibres plays an important role for the tendon’s viscoelastic response. In conclusion, this model can capture the repetitive loading and unloading behaviour of intact and healthy Achilles tendons, which is a critical first step towards understanding tendon homeostasis and function as this biomechanical response changes in diseased tendons.fi_FI
dc.language.isoenfi_FI
dc.publisherPublic Library of Science (PLoS)fi_FI
dc.relation.ispartofseriesPLOS ONE
dc.relation.urihttp://dx.doi.org/10.1371/journal.pone.0126869
dc.rightsCC BY 4.0 http://creativecommons.org/licenses/by/4.0/
dc.subjectTendonsfi_FI
dc.subjectCollagensfi_FI
dc.subjectRatsfi_FI
dc.subjectFinite element analysisfi_FI
dc.subjectSimulation and modelingfi_FI
dc.subjectDeformationfi_FI
dc.subjectExtracellular matrixfi_FI
dc.subjectOptimizationfi_FI
dc.titleA Fibre-Reinforced Poroviscoelastic Model Accurately Describes the Biomechanical Behaviour of the Rat Achilles Tendonfi_FI
dc.typehttp://purl.org/eprint/type/JournalArticle
dc.description.versionPublisher's pdf
dc.contributor.departmentFaculty of Science and Forestry
uef.solecris.id34789443
eprint.statushttp://purl.org/eprint/status/PeerReviewed
dc.type.publicationinfo:eu-repo/semantics/article
dc.rights.accessrights© Authors
dc.relation.doi10.1371/journal.pone.0126869
dc.description.reviewstatushttp://purl.org/eprint/status/PeerReviewed
dc.relation.articlenumbere0126869
dc.relation.issn1932-6203
dc.relation.issue6
dc.relation.volume10
dc.rights.accesslevelopenAccess


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