Analysis of stress induced by screws in the vertebral fixation system

OBJECTIVE: To compare, using photoelasticity, internal stress produced by USS II type screw with 5.2 and 6.2 mm external diameters, when submitted to three different pullout strengths. METHODS: Two photoelastic models were especially made. The simulation was performed using loads of 1.8, 2.4 e 3.3 k...

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Autores principales: Fakhouri, Sarah Fakher, Shimano, Marcos Massao, de Araújo, Cleudmar Amaral, Defino, Helton Luiz Aparecido, Shimano, Antônio Carlos
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Sociedade Brasileira de Ortopedia e Traumatologia 2014
Materias:
Original Articles
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3952865/
https://www.ncbi.nlm.nih.gov/pubmed/24644414
http://dx.doi.org/10.1590/S1413-78522014000100002
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author Fakhouri, Sarah Fakher
Shimano, Marcos Massao
de Araújo, Cleudmar Amaral
Defino, Helton Luiz Aparecido
Shimano, Antônio Carlos
author_facet Fakhouri, Sarah Fakher
Shimano, Marcos Massao
de Araújo, Cleudmar Amaral
Defino, Helton Luiz Aparecido
Shimano, Antônio Carlos
author_sort Fakhouri, Sarah Fakher
collection PubMed
description OBJECTIVE: To compare, using photoelasticity, internal stress produced by USS II type screw with 5.2 and 6.2 mm external diameters, when submitted to three different pullout strengths. METHODS: Two photoelastic models were especially made. The simulation was performed using loads of 1.8, 2.4 e 3.3 kgf.The fringe orders were evaluated around the screws. In all the models analyzed the shear stress were calculated. RESULTS: Independently of the applied load, the smaller screw showed higher values of shear stress. CONCLUSION: According to the analysis performed, we observed that the place of highest stress was in the first thread of the lead, close to the head of the screws. Experimental study.
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spelling pubmed-39528652014-03-18 Analysis of stress induced by screws in the vertebral fixation system Fakhouri, Sarah Fakher Shimano, Marcos Massao de Araújo, Cleudmar Amaral Defino, Helton Luiz Aparecido Shimano, Antônio Carlos Acta Ortop Bras Original Articles OBJECTIVE: To compare, using photoelasticity, internal stress produced by USS II type screw with 5.2 and 6.2 mm external diameters, when submitted to three different pullout strengths. METHODS: Two photoelastic models were especially made. The simulation was performed using loads of 1.8, 2.4 e 3.3 kgf.The fringe orders were evaluated around the screws. In all the models analyzed the shear stress were calculated. RESULTS: Independently of the applied load, the smaller screw showed higher values of shear stress. CONCLUSION: According to the analysis performed, we observed that the place of highest stress was in the first thread of the lead, close to the head of the screws. Experimental study. Sociedade Brasileira de Ortopedia e Traumatologia 2014 /pmc/articles/PMC3952865/ /pubmed/24644414 http://dx.doi.org/10.1590/S1413-78522014000100002 Text en http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Fakhouri, Sarah Fakher
Shimano, Marcos Massao
de Araújo, Cleudmar Amaral
Defino, Helton Luiz Aparecido
Shimano, Antônio Carlos
Analysis of stress induced by screws in the vertebral fixation system
title Analysis of stress induced by screws in the vertebral fixation system
title_full Analysis of stress induced by screws in the vertebral fixation system
title_fullStr Analysis of stress induced by screws in the vertebral fixation system
title_full_unstemmed Analysis of stress induced by screws in the vertebral fixation system
title_short Analysis of stress induced by screws in the vertebral fixation system
title_sort analysis of stress induced by screws in the vertebral fixation system
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3952865/
https://www.ncbi.nlm.nih.gov/pubmed/24644414
http://dx.doi.org/10.1590/S1413-78522014000100002
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