A Finite Element Analysis Of Total En Bloc Spondylectomy

Objective:This study use the finite element model of the single vertebral body total en bloc spondylectomy to study the biomechanical differences between12and8pedicle screws and provide biomechanical reference for clinical application.Methods:We conduct thoracolumbar spinal CT scanning on a male volunteer and use software Mimics, SolidWork and ANSYS to generate two finite element models of the T10vertebral body total en bloc spondylectomy. One of models contains12pedicle screws, another contains8pedicle screws. Applying boundary conditions, compared the biomechanical difference with the two operative methods in the100N,300N,500N load.Results:The stress of the fixed system inside titanium cage and pedicle screw increases as the load increases. Under the condition that the same vertebral body fuses and stresses, the stress of the titanium cage and pedicle screw had no significant differences between the models of12pedicle screws fixed total en bloc spondylectomy and the models of8pedicle screws fixed total en bloc spondylectomy(P>0.05).Conclusions:At the same vertebral body fusion and boundary conditions, both the models of12pedicle screws fixed and8pedicle screws fixed can provide a similar strength of the internal fixation and spinal stability for the patients who accept a single thoracic vertebral total en bloc spondylectomy. The8pedicle screws fixed can obtain the spinal stability after total spondylectomy. We suggest that, the8pedicle screw fixation total en bloc spondylectomy is a better choice in clinical.