摘要
[目的]研究三角固定装置的生物力学特性,并与常规椎弓根螺钉固定方法比较。[方法]建立L3～5TLIF三维有限元模型,分别用双侧椎弓根螺钉固定(BPSF)、单侧椎弓根螺钉固定(UPSF)、三角固定装置固定(TCF)。L3表面施加500 N预载荷,再施加10 N.m的力距模拟腰椎前屈、后伸、左右侧屈、轴向旋转等生理活动,测试不同工况下L4～L5节段角位移,椎弓根螺钉或经椎板关节突螺钉、融合器应力分布情况。[结果]BPSF与TCF L4～L5节段角位移小于UPSF;UPSF的螺钉应力峰值明显高于BPSF、TCF;UPSF椎间融合器的应力峰值在各种工况下高于BPSF、TCF,BPSF与TCF基本相似。[结论]TCF生物力学稳定性优于UPSF,与BPSF相似。
[ Objective] To investigate the biomechanical stability of triangle construct fixation （TCF）, with conventional pedicle screw fixation. [ Methods ] A three - dimensional finite element model were established by simulating bilateral pedicle screw fixation （BPSF）, unilateral pedicle screw fixation （UPSF）, and triangle construct fixation （TCF） . 500 N pre -load was added on the superior surface of the L3 vertebral body, followed by load of 10 N ~ m torque to simulate L4 ~ L5 flexion, exten- sion, lateral bending, and axial rotation. The stress changes and distributions of the three kinds of fixation and cage, the L4 - Ls angular variation under different load were compared and analyzed using software. [ Results ~ TCF and BPSF was able to a- chieve more reduction in angular variation compared with UPSF. The pedicle peak stress in UPSF was markedly higher than that in BPSF and TCF. The cage peak stress in the UPSF was higher than that in BPS F and TCF, BPSF was similar to TCF. [ Conclusion] Biomeehanical stability of the TCF is superior to UPSF, similar to BPSF.
出处
《中国矫形外科杂志》
CAS
CSCD
北大核心
2013年第15期1551-1555,共5页
Orthopedic Journal of China
关键词
有限元模型
经椎板关节突螺钉
三角固定
椎间融合
finite element model, translaminar facet screw, triangle construct fixation, lumbar interbody fusion
