CAJ | 학술논문

目的：基于三维有限元建模方法，建立腰椎弓根动态稳定钉棒系统的模型，初步分析处于不同载荷下腰椎的应力分布及各节段的活动度。方法对一名健康成年男性志愿者行CT扫描，用Mimics 10.01、Abaqus 6.10软件建立正常人L3～S2节段模型。结合Bioflex动态稳定系统建立模型。对模型施加150 N预载荷，在3个主平面施加10 Nm扭矩，获得前屈、后伸、侧屈及旋转6种运动状态下的Bioflex钉棒应力分布和各节段的椎间活动度，初步测定后伸及旋转运动的活动度。结果建立的腰椎L3～S2节段和动态稳定系统有限元模型符合生物力学模型，初步分析显示腰椎动态稳定系统的应力主要集中于螺旋固定棒；在各种加载下，腰椎动态固定的节段活动度明显降低。结论基于三维有限元方法建立的Bioflex腰椎弓动态固定模型能很好地模拟腰椎的动态固定力学活动，可以对固定后的腰椎的应力和各种活动进行很好的模拟，具有很好的研究价值。
목적：기우삼유유한원건모방법，건립요추궁근동태은정정봉계통적모형，초보분석처우불동재하하요추적응력분포급각절단적활동도。방법대일명건강성년남성지원자행CT소묘，용Mimics 10.01、Abaqus 6.10연건건립정상인L3～S2절단모형。결합Bioflex동태은정계통건립모형。대모형시가150 N예재하，재3개주평면시가10 Nm뉴구，획득전굴、후신、측굴급선전6충운동상태하적Bioflex정봉응력분포화각절단적추간활동도，초보측정후신급선전운동적활동도。결과건립적요추L3～S2절단화동태은정계통유한원모형부합생물역학모형，초보분석현시요추동태은정계통적응력주요집중우라선고정봉；재각충가재하，요추동태고정적절단활동도명현강저。결론기우삼유유한원방법건립적Bioflex요추궁동태고정모형능흔호지모의요추적동태고정역학활동，가이대고정후적요추적응력화각충활동진행흔호적모의，구유흔호적연구개치。
Objective To construct the dynamic lumbar pedicle scree system based on the three -dimensional fi-nite element model , thus to preliminarily analyze the stress distribution under different loads and the range of motion (ROM).Methods CT scan of the L3 ~S2 section of a healthy adult male volunteer was performed , while Mimics 10.01 and Abaqus 6.10 software were introduced to establish normal segmental model .Bioflex pedicle screw and elastic rod were used to establish dynamic stability system model .Under 150 N preload, and 10 Nm torque to three principal planes , the stress distribution in flexion , extension , lateral bending and torsion were simulated , while the ROMs of extension and tor-sion were also analyzed .Results The establishment of a lumbar L 3 ~S2 segmental finite element model and the dynamic stability system conformed to biomechanical model .Stress mainly concentrated on the elastic rods , when preliminarily ana-lyzing dynamic stabilization system of the lumbar spine .Under the extension and rotation loads , the ROMs of implanted segments were significantly reduced .Conclusion Based on the three-dimensional finite element method , the established Bioflex lumbar dynamic model can excellently simulate the mechanical activity of the lumbar spine dynamic system ; also simulate the stress of the lumbar spine and all kinds of activities , proved to valuable .