SciELO - Scientific Electronic Library Online

 
vol.33 número1El Sistema Reproductor Femenino de Zearaja chilensis (Guichenot, 1848) (Chondrichthyes, Rajidae): Gametogénesis y Validación Microscópica de los Criterios de MadurezPrecisión en el Diagnóstico del Bucle del Nervio Mental: Estudio Comparativo entre Radiografía Panorámica y Tomografía Computadorizada de Haz Cónico índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Não possue artigos similaresSimilares em SciELO
  • Em processo de indexaçãoSimilares em Google

Compartilhar


International Journal of Morphology

versão On-line ISSN 0717-9502

Resumo

MACEDO, Ana Paula; ISSA, João Paulo Mardegan; DEFINO, Helton Luiz Aparecido  e  SHIMANO, Antonio Carlos. Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method. Int. J. Morphol. [online]. 2015, vol.33, n.1, pp.318-326. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022015000100050.

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.

Palavras-chave : Bone screws; Spine fixation devices; Finite element analysis.

        · resumo em Espanhol     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons