Influência do Raio de Curvatura e Tensões Residuais em Hastes de Implantes Pediculares na Coluna Vertebral

Lucas Verdan Masiero; Anderson Závoli Habib; Luis César Rodríguez Aliaga; Lucas Venâncio Pires de Carvalho Lima

doi:10.14295/vetor.v30i1.12880

Authors

Lucas Verdan Masiero IPRJ/UERJ - Universidade do Estado do Rio de Janeiro
Anderson Závoli Habib UERJ/IPRJ - Universidade do Estado do Rio de Janeiro https://orcid.org/0000-0001-8557-6735
Luis César Rodríguez Aliaga IPRJ/UERJ - Universidade do Estado do Rio de Janeiro https://orcid.org/0000-0002-5397-674X
Lucas Venâncio Pires de Carvalho Lima UERJ/IPRJ - Universidade do Estado do Rio de Janeiro http://orcid.org/0000-0001-6733-5954

DOI:

https://doi.org/10.14295/vetor.v30i1.12880

Keywords:

Pedicular Implants, Finite Elements, Residual Stresses

Abstract

Pedicle rods are used in spinal implants in order to stabilize and correct deformities. In several clinical applications, pedicle rods are molded (cold forming) at the time of surgery, in order, for example, to provide sagittal alignment to the patient. However, the normative test related to these implants (ASTM F1717-04) evaluates the straight configuration (without conformation). The present work seeks to verify the influence of such bending on the rods’ stress state, affecting the implant lifespan. In this work, two effects are evaluated: the influence of the new geometries (by varying radii of curvature) and the influence of residual stresses resulted from bending. The influence of geometry was investigated using finite element modeling using ANSYS Mechanical APDL software. The influence of residual stresses was estimated based on a simplified model proposed by the balance of moments for a circular cross-section. It was found that both effects are significant. For the geometric effects, the rod closest to the point of force application resulted on a lower tractive tension in the posterior part of the implant, while for residual stresses, the effect was the opposite. Greater bending increased in tensile stresses. The present work results point out that it would bebeneficial to use precast pedicle rods in such a way that the manufacturing processes would minimize their residual stresses.

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