微动椎弓根螺钉的生物力学仿真评测

doi:10.12068/j.issn.1005-3026.2019.07.014

东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (7): 986-990.DOI: 10.12068/j.issn.1005-3026.2019.07.014

微动椎弓根螺钉的生物力学仿真评测

刘闯¹，刘齐²，颜云辉¹

(1. 东北大学机械工程与自动化学院，辽宁沈阳110819; 2.中国医科大学附属盛京医院，辽宁沈阳110819)

收稿日期:2017-04-29 修回日期:2017-04-29 出版日期:2019-07-15 发布日期:2019-07-16
通讯作者: 刘闯
作者简介:刘闯(1984-)，男，湖北十堰人，东北大学博士研究生; 颜云辉(1960-)，男，江苏丹阳人，东北大学教授，博士生导师.
基金资助:
教育部科学研究重大项目(313014); 中央高校基本科研业务费专项资金资助项目(N141008001).

Biomechanical Simulation of the Micro-dynamic Pedicle Screw

LIU Chuang¹， LIU Qi²， YAN Yun-hui¹

1. School of Mechanical Engineering ＆ Automation， Northeastern University， Shenyang 110819， China; 2. Shengjing Hospital of China Medical University， Shenyang 110819， China.

Received:2017-04-29 Revised:2017-04-29 Online:2019-07-15 Published:2019-07-16
Contact: LIU Chuang
About author:-
Supported by:
-

摘要/Abstract

摘要： 利用有限元法评估一种微动椎弓根螺钉的生物力学性能.基于人体脊柱CT图像数据建立腰椎L3-L4节段有限元模型，并在此基础上建立坚强固定(M1)、微动固定(M2)、混合固定(M3)3种内固定有限元模型，对有限元模型施加模拟生理载荷，计算内固定节段各项生物力学参数.仿真结果表明，微动椎弓根螺钉在屈伸方向增大了内固定节段的椎间活动度，其中前屈工况增大95%，后伸工况增大83%;改善了载荷在椎间的传递，增大终板正常生理性刺激应力4.25%~5.7%;降低了植入体上的应力集中效应，在前屈、后伸和侧弯工况下降低椎弓根螺钉应力9.2%~16.2%.

关键词: 腰椎, 微动椎弓根螺钉, 有限元, 内固定, 应力

Abstract: By using the finite element method， the biomechanical performance of the micro-dynamic pedicle screw was evaluated. A three-dimensional finite element model of lumbar segments L3-L4 was reconstructed based on CT images of human spine. And on this basis， three kinds of L3-L4 fixed models: rigid fixation(M1)， micro-dynamic fixation(M2) and hybrid fixation(M3) were built to calculate the biomechanical parameters of surgical segments under the simulative physiological load. The simulation results showed that the micro-dynamic pedicle screw increases the range of motion(ROM) of the fixation segments in the direction of flexion and extension(95% in flexion and 83% in extension). The dynamic performance of the screw improves load transmitting between the lumbar motor units， and increases the normal physiological stimulation stress of the endplates by 4.25%~5.7%. Besides， the micro-dynamic fixation reduces the stress concentration effect on the implants， and the reduction of the pedicle screw stress is 9.2%~16.2% under flexion， extension and lateral bending conditions.

Key words: lumbar, micro-dynamic pedicle screw, finite element, internal fixation, stress

中图分类号:

TG156

刘闯，刘齐，颜云辉. 微动椎弓根螺钉的生物力学仿真评测[J]. 东北大学学报:自然科学版, 2019, 40(7): 986-990.

LIU Chuang， LIU Qi， YAN Yun-hui. Biomechanical Simulation of the Micro-dynamic Pedicle Screw[J]. Journal of Northeastern University Natural Science, 2019, 40(7): 986-990.

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微动椎弓根螺钉的生物力学仿真评测

Biomechanical Simulation of the Micro-dynamic Pedicle Screw

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