术中颈椎持续牵引的有限元分析

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Abstract Objective To investigate the safety of using cervical sustained traction during cervical operation.Methods High resolution CT(SOMATOM Definition，Munich，Germany) scan was performed with a healthy adult female volunteer，and data was preserved with DICOM format.The 3D CT model of cervical spine was built with commercially 3D reconstruction software(Mimics17.0 Materialise，Leuven，Belgium).We used the model optimizing software(Catia V5R20，Paris，French) to optimize the mesh and preserved with STL format and the finite element analysis software (Abaqus6.13，Rhode Island，America) to preform finite element analysis.A 10 Nm pure motion was applied to the intact and reconstruction model with neutral，flexation and extension position.Cervical sustained traction (from 50N to 300N) was applied to the model with different position，and the length of cervical canal，transverse diameter and sagittal diameter of each cervical vertebra levels were measured.Results With the increasing of the cervical sustained traction，the biggest increment of length of cervical canal was in extension，and the smallest was in neutral position；the transverse diameter and sagittal diameter of each cervical vertebra levels were both decreased.The mostly decrease of transverse and sagittal diameter was in extension position and least was in neutral position.With 50N sustained traction in neutral position，the length of cervical canal was increased to 1.76％，compared with the flexation and extension position without any traction.The transverse diameter of each cervical vertebra levels were smaller than it in flexation condition，and bigger than it in extension condition except C₆ plane，the sagittal diameter every cervical vertebra plane was the smallest compared with others among these three curvatures，but its increase/reduce value was all less than 1mm.Conclusion With small cervical sustained traction，there is no dangerous of spinal cord injury due to cervical cord stretching or spinal canal stenosis aggravating during the cervical surgery.The traction is a safe and practical method.

Key words： cervical spine intraoperative sustained traction finite element analysis

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