Three-Dimensional Finite Element Analysis Of Spine Tuberculosis Treated By Short Segment Instrumentation With Short Pedicle Screw

Purposes:This topic intends to three-dimensional finite element analysis of the method of single-section and short pedicle screw fixation in spinal tuberculosis surgery,to study the biomechanical characteristics of this fixation mode in order to verify thereliability of this fixation mode,and with short Segmental fixation is compared in terms of the stability of the fixed vertebral body and the stress of the internal fixation system and spine.Thus promoting the maintenance of spine intervertebral activity with fewer fixed fusion segments,so as to achieve the goal of protecting and restoring intervertebral body activity and reducing premature hyperplastic degeneration and instability of the adjacent normal spine motion unit.Methods:Take healthy volunteers,CT on the lumbar 3-5 spinal layer thickness of 1mm continuous scan,the derived image file derived,using Simpleware software to read the file,the production of vertebral cortical bone,cancellous bone,annulus fibrosus,nucleus,Endplate model,according to the normal model to establish a simulated disease model and postoperative model,into the Ansys finite element analysis software to calculate and analyze.Result:Axial compressive force of 5OON was applied to the models of the two internal fixation models in different segments of the spine,and the maximum axial displacement was obtained by calculation.The curves of flexion,flexion,extension and torsion under 10 N were obtained The maximum angle of rotation in the corresponding plane.The experimental data were compared,the statistical analysis,draw conclusions Conclusion:After complete removal of spinal tuberculosis,single segment and short segment pedicle screw fixation could provide reliable fixation of the fixed vertebral body segment(P <0.05),and the stability of the two fixation methods was not obvious Difference(P> 0.05).