Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method

The objective of the present study was to validate virtual models for the study of dual core and cylindrical screws and evaluate the influence of the geometry of the screws on the mechanical behavior and anchoring. Two models of dual core screws were used, one with a double thread and the other with...

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Autores principales:	Macedo,Ana Paula, Issa,João Paulo Mardegan, Defino,Helton Luiz Aparecido, Shimano,Antonio Carlos
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2015
Materias:	Bone screws Spine fixation devices Finite element analysis
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100050
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spelling	oai:scielo:S0717-950220150001000502015-04-09Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element MethodMacedo,Ana PaulaIssa,João Paulo MardeganDefino,Helton Luiz AparecidoShimano,Antonio Carlos Bone screws Spine fixation devices Finite element analysis The objective of the present study was to validate virtual models for the study of dual core and cylindrical screws and evaluate the influence of the geometry of the screws on the mechanical behavior and anchoring. Two models of dual core screws were used, one with a double thread and the other with a single thread, both with a conventional cylindrical screw were used in this study. The stiffness was assessed in a pullout test using polyurethane. Three dimensional virtual models simulating the pullout test were created for finite element analysis. To validate the models, the results were correlated with the mechanical tests. Tensions generated in polyurethane and the screw were studied while simulating the application of force in the direction of the screw pullout, of force transmitted by the rod with the individual standing at rest, and the force transmitted by the rod when performing flexion of the trunk. The dual core screws generated lower tensions in the polyurethane when compared to the cylindrical screw for the forces studied. When evaluating internal tension in the screw, lower levels of tension were presented in the dual core - double thread, higher levels were observed in dual core - single thread, this screw has a smaller internal diameter which may be responsible for this higher generated tension. The dual core screws double thread proportionated good anchorage with more diameter on the region with great tension, avoiding the fracture.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.33 n.1 20152015-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100050en10.4067/S0717-95022015000100050
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Bone screws Spine fixation devices Finite element analysis
spellingShingle	Bone screws Spine fixation devices Finite element analysis Macedo,Ana Paula Issa,João Paulo Mardegan Defino,Helton Luiz Aparecido Shimano,Antonio Carlos Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method
description	The objective of the present study was to validate virtual models for the study of dual core and cylindrical screws and evaluate the influence of the geometry of the screws on the mechanical behavior and anchoring. Two models of dual core screws were used, one with a double thread and the other with a single thread, both with a conventional cylindrical screw were used in this study. The stiffness was assessed in a pullout test using polyurethane. Three dimensional virtual models simulating the pullout test were created for finite element analysis. To validate the models, the results were correlated with the mechanical tests. Tensions generated in polyurethane and the screw were studied while simulating the application of force in the direction of the screw pullout, of force transmitted by the rod with the individual standing at rest, and the force transmitted by the rod when performing flexion of the trunk. The dual core screws generated lower tensions in the polyurethane when compared to the cylindrical screw for the forces studied. When evaluating internal tension in the screw, lower levels of tension were presented in the dual core - double thread, higher levels were observed in dual core - single thread, this screw has a smaller internal diameter which may be responsible for this higher generated tension. The dual core screws double thread proportionated good anchorage with more diameter on the region with great tension, avoiding the fracture.
author	Macedo,Ana Paula Issa,João Paulo Mardegan Defino,Helton Luiz Aparecido Shimano,Antonio Carlos
author_facet	Macedo,Ana Paula Issa,João Paulo Mardegan Defino,Helton Luiz Aparecido Shimano,Antonio Carlos
author_sort	Macedo,Ana Paula
title	Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method
title_short	Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method
title_full	Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method
title_fullStr	Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method
title_full_unstemmed	Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method
title_sort	biomechanical evaluation of a spinal screw fixation system by the finite element method
publisher	Sociedad Chilena de Anatomía
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100050
work_keys_str_mv	AT macedoanapaula biomechanicalevaluationofaspinalscrewfixationsystembythefiniteelementmethod AT issajoaopaulomardegan biomechanicalevaluationofaspinalscrewfixationsystembythefiniteelementmethod AT definoheltonluizaparecido biomechanicalevaluationofaspinalscrewfixationsystembythefiniteelementmethod AT shimanoantoniocarlos biomechanicalevaluationofaspinalscrewfixationsystembythefiniteelementmethod
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Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method

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