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Direct Research Journals
Direct Research Journal of Engineering and Information Technology:Vol.5 (1), pp. 10-15, April 2018
ISSN 2354-4155

Numerical life prediction of lumbar pedicle screw based Construct: Finite element approach
Article Number: DRJA108263904

Original Research Article

Mosbah Moustafa1* and  Bendoukha Mohamed2

1Laboratory of Numerical and Experimental Modeling of Mechanical Phenomena Faculty of Sciences and

Technology FST.

2Department of Mechanical Engineering, University Abd El Hamid Ibn Badis. Mostaganem .Algeria.

Corresponding author E-mail:

date Received: March 3, 2018     date Accepted: April 4, 2018     date Published: April 10, 2018


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 analysis