摘要
目的:应用有限元分析法,评估采用不同螺钉内固定方式在人体骨质疏松性腰椎中生物力学特点,为后期研究提供参考。方法:选择1名65岁老年骨质疏松志愿者,进行CT薄层扫描(层厚0.75 mm),利用Mimics 17.0及Hypermesh 13.0软件建立腰4椎体三维四面体网格有限元模型,并对四种不同螺钉(新型钉道强化椎弓根螺钉、可注射空心椎弓根螺钉、普通椎弓根螺钉骨水泥强化、单纯普通椎弓根螺钉)进行建模、网格划分,通过有限元分析软件Abaqus 2016模拟在骨质疏松腰椎椎体中进行生物力学测试,计算并分析结果。结果:在模拟轴向拔出力试验中,新型钉道强化椎弓根螺钉拔出力最大,为1 508.05 N,可注射空心椎弓根螺钉为1 304.05 N,普通椎弓根螺钉骨水泥强化为1 128.42 N,单纯普通椎弓根螺钉为833.06 N。单纯普通椎弓根螺钉在拔出1.6 mm处出现骨质破坏,螺钉松动,可注射空心椎弓根螺钉、普通椎弓根螺钉骨水泥强化分别在2 mm和1.8 mm处出现骨质破坏,而新型钉道强化椎弓根螺钉螺位移在2.5 mm处才出现骨质破坏。结论:在模拟骨质疏松椎体中,新型骨水泥钉道强化螺钉抗拔出力最强,能有效提高螺钉在钉道内的稳定性。
Objective:To evaluate the biomechanical characteristics of internal fixation by using different pedicle screws in osteoporotic vertebra based on finite element analysis,in order to provide reference for further studies.Method:L4-CT data was collected from a 65 years old osteoporosis elderly volunteer(scanning slice thickness 0.75mm),three-dimensional finite element model of L4 had been built through software of Mimics 17.0 and Hypermesh 13.0.Four different pedicle screw implants(new pedicle screw with cement augmentation,injectable hollow pedicle screws with cement augmentation,conventional pedicle screw with cement augmentation,conventional pedicle screw)had been modeled and tetrahedral meshed.The biomechanics in simulation of human osteoporotic vertebra were evaluated by finite element analysis software Abaqus 2016 and the results were calculated and analyzed.Result:In the simulated axial pull-out test,the new pedicle screw with cement augmentation had the largest pull-out force,which was 1508.05N,injectable hollow pedicle screws with cement augmentation was 1304.05N,conventional pedicle screw with cement augmentation was 1128.42N,conventional pedicle screw was 833.06N.Conventional pedicle screw had bone destruction at 1.6mm of pullout and loosening of screws,injectable hollow pedicle screw,conventional pedicle screw with cement augmentation occurred at 2mm and 1.8mm,respectively,the new screw displacement of pedicle reinforcement occurred only at 2.5mm.Conclusion:In the simulation of osteoporotic vertebra,the resistance of pulling out strength of the new pedicle screw with cement augmentation is strongest and it can improve the stability of pedicle screw in the osteoporotic vertebra effectively.
作者
黄海珊
马航展
李波
HUANG Haishan;MA Hangzhan;LI Bo(Panyu Hospital of TCM in Guangzhou,Guangzhou 511400,China)
出处
《中国医学创新》
CAS
2018年第9期121-124,共4页
Medical Innovation of China
基金
广州市番禺区科技计划项目(2017-Z04-60)
广州市番禺区科技计划重点项目(2017-Z04-13)
关键词
新型椎弓根螺钉
生物力学
有限元分析
New pedicle screw
Biomechanics
Finite element investigation
