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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Detalles Bibliográficos
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
Descripción
Sumario: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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