滑动椎弓根钉系统稳定性体外生物力学测试

A vitro biomechanical study of the stability of slidable pedicle screw system

[目的]对滑动椎弓根钉系统(SPSS)与通用椎弓根钉系统(USS)在脊柱侧凸固定强度、刚度和稳定性等方面进行生物力学比较,以测试滑动椎弓根螺钉内固定系统稳定性的生物力学性能。[方法]采用12具猪新鲜脊柱标本,随机分成两组分别测量不同工况下T12椎体的位移,并计算其强度和刚度进行比较。[结果]滑动组和通用组无论在轴向压缩、前屈、后伸、侧屈情况下,主应变、位移变化及固定强度、刚度均无显著性差异(P>0.05)。[结论]滑动椎弓根钉系统治疗脊柱侧凸同样能够达到通用椎弓根钉系统相同的矫形效果及生物力学稳定性,同时它不影响青少年生长发育。

[ Objective] To study the biomechanical stability of slidable pedicle screw system with the comparison of slidable pedicle screw system and universal pedicle screw system in intensity, rigidity and other biomechanical functions. [ Method ] Twelve spinal specimens of the pig were randomly divided into two groups and the schubweg on the vertebra of T12 were measured in different conditions. In the end the intensity and rigidity of two groups were compared which were computed by the schubweg. [ Result] There was no significant difference between the two groups with the straining, schubweg, intensity and rigidity in different conditions（P 〉0.05）. [ Conclusion]There are the same correct effectiveness and the biomechanical stability in the treatment with the slidable pedicle screw system and universal pedicle screw system, meanwhile there is no effect in the adolescent growth.