皮质骨轨迹螺钉技术应用于骨质疏松患者腰椎固定的有限元分析A finite-element analysis on biomechanical performance of lumbar cortical bone trajectory versus traditional trajectory screw fixation in osteoporosis
吴晓宇;王哲;甘浩然;刘向东;吴彦超;董谢平;
摘要(Abstract):
[目的]通过有限元方法对传统轨迹椎弓根(traditional trajectory,TT)螺钉与椎弓根皮质骨轨迹(cortical bone trajectory,CBT)螺钉固定在骨质疏松椎体上的应用进行生物力学分析。[方法]通过1名骨质疏松症患者(骨密度T值<-0.25 SD)建立L2、3椎体功能单元骨质疏松有限元模型,模拟传统椎弓根螺钉和皮质骨轨迹螺钉两种固定方式进行固定,分别在静载、前屈、后伸、侧屈、旋转五种状态下加载并测量钉道周围骨质的CT值,比较各部件最大应力值、内固定装置稳定性(以椎间活动度表示)及钉道周围骨质CT值的差异。[结果]CBT组在各个状态下椎骨和内固定装置的最大应力值均大于TT组,椎间活动度在静载、前屈、后伸、旋转四个状态下CBT组均小于TT组,侧屈时CBT组大于TT组;CBT组钉道周围骨质的CT值为(192.20±34.85)Hu,TT组为(118.00±15.90)Hu,组间对比差异有统计学意义(P=0.002)。[结论]CBT组屈伸、旋转状态下稳定性大于TT组,侧屈时CBT组稍小于TT组;CBT组钉道周围骨质CT值大于TT组。CBT螺钉技术是骨质疏松患者腰椎内固定的一种优选方式。
关键词(KeyWords): 骨质疏松;腰椎;椎弓根螺钉;皮质骨轨迹;有限元
基金项目(Foundation):
作者(Author): 吴晓宇;王哲;甘浩然;刘向东;吴彦超;董谢平;
Email:
DOI:
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