摘要
通过建立螺钉固定的腰椎L_4～L_5的三维有限元模型(FEM)对腰椎进行生物力学分析。扫描获取1例骨质疏松男性腰椎L_4～L_5的空间几何信息,建立有限元模型并分析其应力应变状态。运动单元的最大应力区域位于螺钉的横联以及钉棒,椎体的最大应力位于椎间盘与上、下终板的接触面。运动单元应变位于椎体。CBT螺钉的使用不会显著改变TT螺钉固定时的椎体受力特征,且有利于控制椎体运动单元的变形和位移,使得运动单元更加稳定,其临床应用效果要优于TT螺钉。融合器的置入可以减轻运动单元最大应力、最大应变及活动自由度降低。
The three-dimensional finite element model of the lumbar spine L4-L5 with screw fixation was established to perform the biological mechanics analysis.The information of the lumbar spine L4-L5 of a male osteoporosis was scanned.With the information,the FEM model of the L4-L5 motor unit was built and the stress,strain and the free degree of the motor unit were investigated.The maximum stress zone of the motor unit is located on the lateral combination and rob,while the maximum stress zone of the spine is located on the interface between the upper,lower endplate and the intervertebral disc.The maximum strain of the motor unit is located on the lumbar spine,and the distribution is associated with that of stress.The application of CBT doesn’t change the distribution characteristic of strain and stress of TT.Besides CBT has a positive meaning for controlling the displacement and deformation of the motor unit and make the motor unit more stable.Therefore,the clinical performance of the CBT is better.Similarly,the introduction of cage has the same effect.
作者
武洵
申才良
Wu Xun;Shen Cailiang(Dept of Orthopedics,The First Affiliated Hospital of Anhui Medical University,Hefei 230022)
出处
《安徽医科大学学报》
CAS
北大核心
2019年第3期482-487,共6页
Acta Universitatis Medicinalis Anhui
基金
安徽省2017年度第一批科技计划项目(编号:1704a0802158)
