Non-invasive assessment of soft-tissue artifact and its effect on knee joint kinematics during functional activity.

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dc.contributor.author Akbarshahi, M en
dc.contributor.author Schache, AG en
dc.contributor.author Fernandez, Justin en
dc.contributor.author Baker, R en
dc.contributor.author Banks, S en
dc.contributor.author Pandy, MG en
dc.coverage.spatial United States en
dc.date.accessioned 2012-02-07T22:38:56Z en
dc.date.issued 2010-05-07 en
dc.identifier.citation Journal of Biomechanics 43(7):1292-1301 07 May 2010 en
dc.identifier.issn 0021-9290 en
dc.identifier.uri http://hdl.handle.net/2292/10926 en
dc.description.abstract The soft-tissue interface between skin-mounted markers and the underlying bones poses a major limitation to accurate, non-invasive measurement of joint kinematics. The aim of this study was twofold: first, to quantify lower limb soft-tissue artifact in young healthy subjects during functional activity; and second, to determine the effect of soft-tissue artifact on the calculation of knee joint kinematics. Subject-specific bone models generated from magnetic resonance imaging (MRI) were used in conjunction with X-ray images obtained from single-plane fluoroscopy to determine three-dimensional knee joint kinematics for four separate tasks: open-chain knee flexion, hip axial rotation, level walking, and a step-up. Knee joint kinematics was derived using the anatomical frames from the MRI-based, 3D bone models together with the data from video motion capture and X-ray fluoroscopy. Soft-tissue artifact was defined as the degree of movement of each marker in the anteroposterior, proximodistal and mediolateral directions of the corresponding anatomical frame. A number of different skin-marker clusters (total of 180) were used to calculate knee joint rotations, and the results were compared against those obtained from fluoroscopy. Although a consistent pattern of soft-tissue artifact was found for each task across all subjects, the magnitudes of soft-tissue artifact were subject-, task- and location-dependent. Soft-tissue artifact for the thigh markers was substantially greater than that for the shank markers. Markers positioned in the vicinity of the knee joint showed considerable movement, with root mean square errors as high as 29.3mm. The maximum root mean square errors for calculating knee joint rotations occurred for the open-chain knee flexion task and were 24.3 degrees , 17.8 degrees and 14.5 degrees for flexion, internal-external rotation and abduction-adduction, respectively. The present results on soft-tissue artifact, based on fluoroscopic measurements in healthy adult subjects, may be helpful in developing location- and direction-specific weighting factors for use in global optimization algorithms aimed at minimizing the effects of soft-tissue artifact on calculations of knee joint rotations. en
dc.language eng en
dc.publisher Elsevier Ltd. 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. Deatils obtained from: http://www.sherpa.ac.uk/romeo/issn/0021-9290/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Adult en
dc.subject Biomechanics en
dc.subject Fluoroscopy en
dc.subject Hip en
dc.subject Humans en
dc.subject Imaging, Three-Dimensional en
dc.subject Knee Joint en
dc.subject Magnetic Resonance Imaging en
dc.subject Male en
dc.subject Models, Biological en
dc.subject Range of Motion, Articular en
dc.title Non-invasive assessment of soft-tissue artifact and its effect on knee joint kinematics during functional activity. en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.jbiomech.2010.01.002 en
pubs.issue 7 en
pubs.begin-page 1292 en
pubs.volume 43 en
dc.rights.holder Copyright: Elsevier Ltd. en
dc.identifier.pmid 20206357 en
pubs.end-page 1301 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 156305 en
pubs.org-id Bioengineering Institute en
pubs.org-id ABI Associates en
pubs.org-id Engineering en
pubs.org-id Engineering Science en
dc.identifier.eissn 1873-2380 en
dc.identifier.pii S0021-9290(10)00033-3 en
pubs.record-created-at-source-date 2012-02-08 en
pubs.dimensions-id 20206357 en


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