摘要
目的探讨腰椎Isola椎弓根钉系统内固定和DIAM固定后椎体的生物力学特性的变化。方法 9具尸体腰椎(L1～5)标本建立力学测试模型,分为A:正常对照组;B:腰椎DIAM固定组;C:腰椎Isola椎弓根钉系统内固定组。应力加载方式为轴向压缩、前屈、后伸、侧屈等4种,测试各种工况的生物力学变化。结果采用DIAM固定,腰椎的集中应力被分散,同时起到了固定的作用。Isola椎弓根钉系统内固定同样能使椎体稳定,但是坚强内固定较正常椎体应力下降过大,形成应力遮挡,增加了邻近节段的应力水平。结论 DIAM棘突间植入物能够改善由于后部结构缺损造成的脊柱稳定性降低。Isola椎弓根钉系统能增强腰椎的稳定性,但融合相邻节段的应力增加。
Objective To investigate the biomechanical effects of Isola pedicle screw internal fixation and DIAM fixation for lumbar spine.Methods Nine fresh cadaveric L1-L5 specimens were used and divided into three groups:A:Normal specimen;B:the DIAM fixation group;C:Isola pedicle screw internal fixation group.The specimen mechanical parameters which correlated to load under conditions such as axial compression,flex,extension and lateral bending,were tested and collected.Results The DIAM fixation could not only stabilize spine well,but also decrease the stress concentration.The Isola system fixed solidly,but the stress concentrated excessively contrasted to that of normal vertebral body,and increased the stress of adjacent segments.Conclusions The spinal stabilization is step down when the posterior structure of lumbar is defected by removal the nucleus and disc,and the DIAM can improve the unsteadiness.The Isola system fixed solidly,but the stress of adjacent levels increase.
出处
《中华临床医师杂志（电子版）》
CAS
2011年第15期4432-4437,共6页
Chinese Journal of Clinicians(Electronic Edition)
关键词
腰椎
植入物
实验性
生物力学
内固定器
Lumbar vertebrae
Implants,experimental
Biomechanics
Internal fixators
