engleski

Biomechanical stability analysis of transpedicular screws combined with sublaminar hook-rod system using the finite element method

The aim of the paper is to develop and test a new posterior stabilization system by augmenting the posterior hook-rod system with screws and rods. A biomechanical analysis was performed using the finite element method. The anatomical structures were modeled based on computed tomography data. Instrumentation (hooks, rods, and screws) was modeled based on the data obtained by 3D scanning. The discretized model was verified by converging solutions and validated against data from a previously published experiment. A Th12-L1 spinal segment was modeled and modified by removing the body of the L1 vertebra (corpectomy) and the entire L1 vertebra (spondylectomy). The model was additionally modified by incorporating stabilization systems: i) posterior stabilization (transpedicular screws and rods) ; ii) combined posterior stabilization with sublaminar hooks ; and iii) combined anterior (titanium cage) and posterior (sublaminar hooks) stabilization. The rotation angles in each group, and the strains on each part of the three stabilization constructs, were analyzed separately.

biomechanical stability ; screws ; hook-rod system ; finite element method

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