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The influence of the ""penetration-"" and the ""filling-ratios"" on the pull-out strength of transpedicular screws

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dc.contributor.author Kourkoulis, SK en
dc.contributor.author Chatzistergos, P en
dc.date.accessioned 2014-03-01T01:58:50Z
dc.date.available 2014-03-01T01:58:50Z
dc.date.issued 2009 en
dc.identifier.issn 02195194 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/28748
dc.subject Filling ratio en
dc.subject Finite element method en
dc.subject Penetration ratio en
dc.subject Pull-out force en
dc.subject Transpedicular screws en
dc.title The influence of the ""penetration-"" and the ""filling-ratios"" on the pull-out strength of transpedicular screws en
heal.type journalArticle en
heal.identifier.primary 10.1142/S0219519409003012 en
heal.identifier.secondary http://dx.doi.org/10.1142/S0219519409003012 en
heal.publicationDate 2009 en
heal.abstract The stress field developed in the human lumbar vertebral bone due to the presence of transpedicular fixation screws is studied in an attempt to quantify the force required to pull the screw out of the bone. The study is focused on the pure pull-out phenomenon, namely the case in which the external loads act parallel to the longitudinal axis of the screw. The parameters considered are the penetration ratio, i.e. the ratio of the screw length divided by the distance from the posterior pedicle entrance site to the anterior vertebral cortex, and the filling ratio, i.e. the ratio of the major diameter of the screw divided by the transverse diameter of the pedicle. The study is carried out numerically with the aid of the finite element method. The analysis takes into account both the variation of the mechanical properties of the bone in terms of the distance from its surface as well as the geometrical details of a typical transpedicular screw. The results of the analysis are compared with existing experimental data from the literature and the comparison is very satisfactory. © 2009 World Scientific Publishing Company. en
heal.journalName Journal of Mechanics in Medicine and Biology en
dc.identifier.doi 10.1142/S0219519409003012 en
dc.identifier.volume 9 en
dc.identifier.issue 3 en
dc.identifier.spage 283 en
dc.identifier.epage 300 en


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