两种长度的颈椎椎弓根螺钉与侧块螺钉拔出试验比较

Pull-out strength of cervical pedicle short screws and pedicle long screws and lateral mass screws,a biomechanical comparison

中文关键词:  颈椎 椎弓根 侧块 螺钉 生物力学

英文关键词:Cervical spine,Cervical pedicle,Lateral mass,Screw fixation,Biomechanics

中文摘要:

  目的:比较两种长度的颈椎椎弓根螺钉和侧块螺钉的抗拔出力,探讨颈椎经椎弓根短螺钉固定的可行性。方法:5具C3~C5共15节新鲜颈椎标本,用长度为28mm和20mm的皮质骨螺钉分别置入椎弓根,并用20mm的螺钉行侧块双皮质固定,螺钉进入侧块深度约14mm。行拔出试验,比较螺钉的最大轴向拔出力。结果:椎弓根长螺钉的最大拔出力为650N,椎弓根短螺钉为585N,两者比较无显著性差异(P>0.01);侧块螺钉的最大拔出力为360N,与椎弓根短螺钉比较有显著性差异(P<0.0001)。结论:颈椎椎弓根短螺钉固定可提供足够的稳定性,其安全性相对较高。

英文摘要:

  Objective:To determine whether the poll-out strength of cervical short pedicle(20mm) screw is comparable with that of long pedicle(28mm) screw and whether it is significantly stranger than that of lateral mass screw.Method:15 fresh cervical specimens of 5