Achilles tendon stress is more sensitive to subject-specific geometry than subject-specific material properties: A finite element analysis

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dc.contributor.author Hansen, W en
dc.contributor.author Shim, Bo en
dc.contributor.author Obst, S en
dc.contributor.author Lloyd, DG en
dc.contributor.author Newsham-West, R en
dc.contributor.author Barrett, RS en
dc.date.accessioned 2017-07-09T22:10:50Z en
dc.date.issued 2017-05 en
dc.identifier.citation Journal of Biomechanics 56:26-31 May 2017 en
dc.identifier.issn 1873-2380 en
dc.identifier.uri http://hdl.handle.net/2292/34103 en
dc.description.abstract This study used subject-specific measures of three-dimensional (3D) free Achilles tendon geometry in conjunction with a finite element method to investigate the effect of variation in subject-specific geometry and subject-specific material properties on tendon stress during submaximal isometric loading. Achilles tendons of eight participants (Aged 25-35years) were scanned with freehand 3D ultrasound at rest and during a 70% maximum voluntary isometric contraction. Ultrasound images were segmented, volume rendered and transformed into subject-specific 3D finite element meshes. The mean (±SD) lengths, volumes and cross-sectional areas of the tendons at rest were 62±13mm, 3617±984mm3 and 58±11mm2 respectively. The measured tendon strain at 70% MVIC was 5.9±1.3%. Subject-specific material properties were obtained using an optimisation approach that minimised the difference between measured and modelled longitudinal free tendon strain. Generic geometry was represented by the average mesh and generic material properties were taken from the literature. Local stresses were subsequently computed for combinations of subject-specific and generic geometry and material properties. For a given geometry, changing from generic to subject-specific material properties had little effect on the stress distribution in the tendon. In contrast, changing from generic to subject-specific geometry had a 26-fold greater effect on tendon stress distribution. Overall, these findings indicate that the stress distribution experienced by the living free Achilles tendon of a young and healthy population during voluntary loading are more sensitive to variation in tendon geometry than variation in tendon material properties. en
dc.format.medium Print-Electronic en
dc.language eng en
dc.publisher Elsevier BV en
dc.relation.ispartofseries Journal of Biomechanics en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Achilles Tendon en
dc.subject Humans en
dc.subject Ultrasonography en
dc.subject Isometric Contraction en
dc.subject Finite Element Analysis en
dc.subject Stress, Mechanical en
dc.subject Adult en
dc.subject Female en
dc.subject Male en
dc.title Achilles tendon stress is more sensitive to subject-specific geometry than subject-specific material properties: A finite element analysis en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.jbiomech.2017.02.031 en
pubs.begin-page 26 en
pubs.volume 56 en
dc.rights.holder Copyright: Elsevier en
dc.identifier.pmid 28359571 en
pubs.end-page 31 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 621269 en
pubs.org-id Bioengineering Institute en
pubs.org-id ABI Associates en
dc.identifier.eissn 1873-2380 en
pubs.record-created-at-source-date 2017-07-10 en
pubs.dimensions-id 28359571 en


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