摘要
目的设计并探讨新型半硬性椎弓根螺钉固定器的力学稳定性。方法收集6具新鲜小牛脊柱标本,截取T11-L1作为试件,建立失稳模型后顺次安放新型硬性椎弓根钉固定器(new rigid device,NRD)、新型半硬性椎弓根螺钉固定器(new semirigid device,NSRD)及硬性椎弓根固定器(rigiddevice,RD),进行脊柱三维运动测试。结果3种椎弓根螺钉内固定器均能在各个运动方向上显著增加失稳节段稳定性;屈伸及右旋转时,RD固定后明显增加了相邻节段的活动范围,而在各个运动方向上,NRD、NSRD固定后下相邻节段的活动范围均没有变化。结论NSRD在为失稳的脊柱节段提供即刻的稳定性同时,不会影响相邻节段的活动范围,符合半硬性固定的原则。
Objectives To evaluate the biomechanical stability of an new semirigid pedicle screw fixation device. Methods A model of destabilized spine was produced on six specimens of fresh calf cadaver spine from T11 to L1. Three fixation devices, (NRD、NSRD and RD) were ordinal applied in the specimens to strengthen the destabilized level. Ranges of three dimensional movements were measured in intact, destabilized and stabilized specimens, respectively. Results Three fixation devices all could provide significant sta...
出处
《医用生物力学》
CAS
CSCD
2008年第4期317-320,326,共5页
Journal of Medical Biomechanics
