抄録
A representative surgery of scoliosis is the posterior correction and fusion using spinal fixation device. The aim of this study is to evaluate usability of minor diameter rod for spinal fixation device. Lumbar finite element (FE) models from the Ll vertebra to the L5 vertebra with segmental pedicle screw fixation were reconstructed. Four rod diameter in spinal fixation device were used. Two types of loading conditions were evaluated, including flexion and lateral bending under preload with 200N of axial compressive force on the superior surface of the Ll vertebra. The inferior end surface of the L5 vertebra was assumed to be fully constrained. As a result, it was found that von Mises stresses in the minor rod diameter of spinal fixation device were lower than the fatigue strength of titanium alloy.
