内固定器对人体颈椎运动生物力学性能的影响

在失稳颈椎内安装固定器后,其稳定性的生物力学评价是医学研究的一个重要课题。该文提出了一种双目三维光学精密运动测量方法对其进行评价。采用该方法分别对保存良好的人体颈椎标本在失稳、内固定以及疲劳3种状态下的三维运动情况(包括前屈、后伸、左侧弯、右侧弯4种运动)进行了测量,并以每种运动情况下的颈椎C 1-C 2节相互旋转角度衡量其内固定的效果。实验结果表明,内固定后颈椎的旋转角度明显小于失稳时的旋转角度;内固定后模拟远期效果的疲劳加载后测试结果证实内固定的效果仍然是可靠的。

Impact of the inner fixing device on the biomechanics of the human cervical spine

Medical devices are used to fix the inner service of the cervical spine to reconstruct the stability of cervical spine after injury or disease.The biomechanics of the fixing device were studied with a binocular 3D optical testing method.The 3D motion information(including ante-flexion,back-stretch,nearside bending,and starboard bending of the human cervical spine were measured for unstable,fixed,and fatigue loading states.The rotation angle of the cervical spine C1-C2 was used to evaluate the effect of the fixation device.The experimental results show that after inner fixation,the cervical rotation angle is clearly less than for the unstable state while the fatigue testing results confirm that the inner fixation device effectively improves a damaged cervical spine.The tests also show that the binocular 3D measuring technique can provide very useful biomechanics data.