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A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

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dc.contributor.author Chatzistergos, PE en
dc.contributor.author Magnissalis, EA en
dc.contributor.author Kourkoulis, SK en
dc.date.accessioned 2014-03-01T01:32:29Z
dc.date.available 2014-03-01T01:32:29Z
dc.date.issued 2010 en
dc.identifier.issn 1350-4533 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/20163
dc.subject Bone screws en
dc.subject Pullout force en
dc.subject Finite element analysis en
dc.subject Cohesive zone en
dc.subject Synthetic bone en
dc.subject.classification Engineering, Biomedical en
dc.subject.other CANCELLOUS BONE SCREWS en
dc.subject.other HOLDING POWER en
dc.subject.other OUT STRENGTH en
dc.subject.other BIOMECHANICAL TESTS en
dc.subject.other ORTHOPEDIC SCREWS en
dc.subject.other THREAD DESIGN en
dc.subject.other HUMAN SPINE en
dc.subject.other FIXATION en
dc.subject.other COMPLICATIONS en
dc.subject.other REPLACEMENT en
dc.title A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.medengphy.2009.11.003 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.medengphy.2009.11.003 en
heal.language English en
heal.publicationDate 2010 en
heal.abstract The present study aims to the design of a finite-element model simulating accurately the pullout behaviour of cylindrical pedicle screws and predicting their pullout force. Three commercial pedicle screws, subjected to pure pullout from synthetic bone, were studied experimentally. The results were used for the design, calibration and validation of a finite-element model. Special attention was paid to the accurate simulation of the failure inside the host material under shear. For this purpose, a bilinear cohesive zone material model was adopted, controlling the mode-II debonding of neighbouring elements in the vicinity of the screw. Comparison between experimental and numerical results proved that the implementation of this approach can significantly enhance the accuracy of the numerical simulation of a screw's mechanical behaviour under pure pullout loads. The numerical model was used for the parametric study of various factors affecting the pullout performance of a cylindrical pedicle screw. It was concluded that the major parameter influencing the pullout force is the outer radius (increasing its value by 36% increases the pullout force by 34%). The influence of the purchase length of the screw is of similar quantitative nature. The respective dependence on the thread inclination, depth and pitch was significantly weaker. (C) 2009 IPEM. Published by Elsevier Ltd. All rights reserved. en
heal.publisher ELSEVIER SCI LTD en
heal.journalName MEDICAL ENGINEERING & PHYSICS en
dc.identifier.doi 10.1016/j.medengphy.2009.11.003 en
dc.identifier.isi ISI:000276189800006 en
dc.identifier.volume 32 en
dc.identifier.issue 2 en
dc.identifier.spage 145 en
dc.identifier.epage 154 en


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