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Biomechanical Evaluation and Comparison of Spinal Fixators in the Lumbar (L3–L4) Region Using the Finite Element Method

Authors :

Nima Moazed¹ Mohammad Haghpanahi²

1- دانشگاه علم و صنعت ایران 2- دانشگاه علم و صنعت ایران

Keywords :

Biomechanical Analysis،Spinal Fixation،Lumbar Spine،Finite Element Method،Pedicle Screw and Rod

Abstract :

Treatment of fractures, deviations, and abnormalities of the spine requires precise and appropriate tools based on various concepts such as rigid stabilization systems, semi-rigid stabilization, and dynamic stabilization. In this study, the biomechanical evaluation of different stabilization systems in the lumbar region (L3-L4) was performed using finite element analysis. A healthy spine model without stabilization and three stabilized models with different rods were considered: a conventional simple rod (rigid stabilization), a curved rod (dynamic), and a notched rod. All spinal models were loaded with a compressive force of 400 Newtons and a moment of 10 Newton-meters in four movements: flexion, extension, lateral bending, and axial rotation. The results for range of motion (ROM), percentage reduction in range of motion, von Mises stress, and percentage reduction in von Mises stress were compared. Precision biomechanical tools for the spine are significantly sensitive to geometric features. The obtained results showed that all three rod models used resulted in the fusion of the lumbar vertebrae (L3-L4). However, considering that the stress and strain on the pedicle screw are critical factors in reducing complications and failures of the spinal stabilization system, the notched rod, due to its lower stress compared to other models, has the best performance.