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首页> 外文会议>International Mechanical Engineering Congress and Exposition >SEGMENTAL KINEMATICS OF CERVICAL SPINE LAMINECTOMY
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SEGMENTAL KINEMATICS OF CERVICAL SPINE LAMINECTOMY

机译：颈椎椎间膜切除术的节段性运动学

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This study was undertaken to determine the localized kinematics of the cervical spine under intact and laminectomized conditions. Unembalmed human cadaver cervical columns (C2-T2) were fixed at the two ends. Retro reflective targets were introduced into the bony landmarks of the vertebral bodies, facets and spinous processes to obtain the localized kinematics. The cervical column was tested under controlled combined compression-flexion forces to a maximum moment of 10 Nm. Applied force and deflection data were recorded using a modular digital data acquisition system. After testing the intact cervical column, a three-level laminectomy was performed at its mid-height. Testing was repeated and biomechanical data were gathered. Results indicated that the mechanical responses were nonlinear, typical of biological materials. Stiffnesses for the intact specimen (7.10 N/mm ± 1.13) were higher compared to laminectomized preparations (6.03 N/mm ±1.12). In general, laminectomy from C4-C6 affected the segmental motions from C3-C7 joints. Alterations in the motions were most pronounced at C5 compared to the adjacent C4 and C6 levels indicating the weakest link in the region of laminectomy. The greatest motion increase was at C5 with a decreasing motion proximal and distal to this level. Intact specimens had smaller overall sagittal planar rotation angle change (3.9 degrees ±2.0) compared to laminectomized preparations (9.8 degrees ±1.8) indicating the added flexibility due to laminectomy. These findings suggest that, in a multiple level laminectomy, the largest motion changes (at the facet joint) that occur in the middle of the laminectomized region of the spine produce greater localized flexion angles at the affected segment. These increased motions and the resulting accentuated strains at this local level may lead to long-term changes in the curvature of the spine.
机译：本研究旨在确定完整和层压化条件下的颈椎的局部运动学。 UnemalMed人尸体宫颈柱（C2-T2）固定在两端。复古反光目标被引入椎体，小平面和棘突的骨骼地标，以获得局部运动学。将宫颈柱在控制的组合压缩力下测试到最大矩10nm。使用模块化数字数据采集系统记录施加的力和偏转数据。在测试完整的颈柱后，在其中间高度进行三层叠层切除术。重复测试，并聚集生物力学数据。结果表明，机械反应是非线性的，典型的生物材料。与叠层制剂相比，完整试样的刚度（7.10n / mm±1.13）更高（6.03 n / mm±1.12）。通常，来自C4-C6的椎体切除术影响来自C3-C7关节的节段运动。与相邻的C4和C6水平相比，在C5和C6水平相比，该动作的改变是表示椎体切除术区域中最弱的连杆的C5。最大的动作增加在C5处，近端和远端的运动减少。与叠层制剂（9.8度±1.8）相比，完整的样品具有较小的整体矢状平面旋转角变化（3.9度±2.0），表明由于层压切除术引起的柔韧性。这些发现表明，在多级层压切除术中，在脊柱的叠层区域的中间发生的最大运动变化（在小环接头处）在受影响的段处产生更大的局部屈曲角度。这些局部水平的这些运动和所得的突出菌菌株可能导致脊柱曲率的长期变化。

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