Speaker
Description
This study employs finite element analysis (FEA) to investigate the mechanical behaviour of implant rod-screw systems in the correction of spinal deformities, specifically focusing on scoliosis. The research aims to assess the influence of different spine deformity angles on the mechanical stress distribution of implant rod-screw and correlate with the influence of correction rate. A finite element model was developed,
combining realistic geometry and material properties to simulate the interaction between the rod and screw where the force was applied. Various deformity angles that are representative of scoliotic conditions are considered, and the mechanical stress distribution was quantitatively evaluated. The study further explores the correlation between deformity angles and the mechanical stress study experienced by the implant rod-screw system. By systematically varying the deformity angles, the seeks to investigate how alterations in rod curvature affect the load distribution across the implanted construct. Additionally, the investigation also looked into the influence of correction rates on mechanical stress. Different correction scenarios are simulated to
analyze the dynamic response of the implant rod-screw system under varying degrees of correction then providing insights into optimal correction strategies for minimizing stress concentrations. The outcomes of this research contribute to a deeper understanding of the biomechanics involved in the implant-rod correction of scoliosis and offer valuable data
as a guide for surgeons to apply force during the implementation of rod-screw. This knowledge can potentially provide clinical decision-making processes and contribute to the development of more effective spinal deformity correction strategies without any failure such as rod fracture. From this analysis, when the correction rate is maximum for each deformity angle, the corrective force increases as deformity angles increase. This results in a constant value range for von Mises stress which is below 790 MPa. For the effect of deformity angles on mechanical stress, it shows that von Mises stress increases when deformity angles increase. The same goes for the influence of correction rate to mechanical stress, the von Mises stress increases when the correction rate increases.
Keywords
Implant, pedicle screw, spine deformity, finite element analysis
