Original Research Article
Numerical life prediction of lumbar pedicle screw based Construct: Finite element approach
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Article Number: DRJA108263904
DOI: https://doi.org/10.26765/DRJEIT.2018.3904
ISSN: 2354-4155
Vol.5 (1), pp. 10-15, April 2018
Copyright © 2018
Author(s) retain the copyright of this article
Abstract
This project intended to analyze the fatigue life of a rigid posterior lumbar spine fusion structure, the finite element analysis (FEA) was used to explore the fatigue behavior of the stabilization system. The conventional rigid stabilization is widely being used in orthopedic surgery and presumed to be the gold solution of degenerative disorders (Sengupta et al., 2001). We study the fatigue, deformation and safety factors. It was observed that the simulation results are in good agreement with experimental cases. To acquire a more realistic simulation, boundary conditions were applied according to standards specified in the ASTM Standard F1717-04 (ASTM, 2013). Three-dimensional Model of the stabilization structure with two rods were built by the Solid Works 2013, and imported into ANSYS software for static analysis using ncode design life for fatigue analysis. The maximum and minimum stresses of risk nodes under different loads and moments were located. The fatigue life was then assessed using relevant mathematical formula of S-N curve and Goodman curve. It was found that the stress at the middle of the crossbeam between the two bars is larger than the surroundings and is liable to suffer from fatigue. Three different types of materials were selected during analysis. Two materials were used: Ti-6Al-4V and 316L and UHMWPE. Minimum fatigue cycles, critical fatigue areas, stresses and safety factor values have been identified. The predicted results showed that this system was safe enough in terms of fatigue life. As a result of fatigue analysis, and found to be successful. The current study has also demonstrated that analyzing spinal implants with the FE method and applied with confidence to support standard fatigue testing and used as an alternative.
Keywords: Posterior; lumbar; spine; fatigue; The Finite Element analysisReceived: March 3, 2018 Accepted: April 4, 2018 Published: April 10, 2018