Three-dimensional intervertebral kinematics in the healthy young adult cervical spine during dynamic functional loading
Three-dimensional intervertebral kinematics in the healthy young adult cervical spine during dynamic functional loading
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DOI：
10.1016/j.jbiomech.2015.02.049
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发表时间：
2015-05-01
影响因子：
2.4
通讯作者：
Kang, James D.
中科院分区：
文献类型：
--
作者：
Anderst, William J.;Donaldson, William F., III;Kang, James D.
本研究的目的是确定年轻健康颈椎在动态、三维、功能性负荷下的椎间运动学。椎间运动的特点是活动范围（ROM）和螺旋运动轴（HAM）。以30张图像/s的速度收集颈椎的双平面X线片，29名参与者（20-35岁）进行动态屈曲\伸展、轴向旋转和侧弯。使用经验证的基于体积模型的跟踪过程（将受试者特定的基于CT的骨模型与X线片匹配），以亚毫米精度跟踪椎体运动（屈曲/伸展时的C1-T1，侧弯和轴向旋转时的C3-T1）。C2-C3运动节段（12.7 +/- 2.6度）的颈椎\伸展活动度最小，C5-C6运动节段（19.7 +/- 3.7度）最大。在头侧向弯曲和轴向旋转过程中，每个运动节段的椎间弯曲ROM均大于旋转ROM。HAM表现出运动节段之间和运动之间的差异。在屈曲/伸展期间，螺旋运动轴的方向几乎垂直于C2-C3至C7-T1运动节段的矢状面。在侧弯期间，HAM和横向平面之间的角度从C6-C7运动节段（约+/-22度）到C3-C4运动节段（约+/-40度）逐渐增加。在轴向旋转期间，C3-C4至C5-C6运动节段的横向平面和HAM之间的角度约为+/- 42度，C6-C7运动节段约为+/- 32度。本研究为评价年龄、退变和手术方式对三维动态功能负荷下颈椎运动学的影响提供了有价值的参考数据。(C)2015爱思唯尔有限公司版权所有。
The objective of this study was to determine the intervertebral kinematics of the young, healthy cervical spine during dynamic, three-dimensional, functional loading. Intervertebral motion was characterized by the range of motion (ROM) and the helical axis of motion (HAM). Biplane radiographs of the cervical spine were collected at 30 images/s as 29 participants (20-35 yr) performed dynamic flexion\extension, axial rotation, and lateral bending. Vertebral motion (C1-T1 in flexion\extension, C3-T1 in lateral bending and axial rotation) was tracked with sub-millimeter accuracy using a validated volumetric model-based tracking process that matched subject-specific CT-based bone models to the radiographs. Flexion\extension ROM was smallest at the C2-C3 motion segment (12.7 +/- 2.6 degrees) and largest at the C5-C6 motion segment (19.7 +/- 3.7 degrees). During head lateral bending and axial rotation, the intervertebral bending ROM was greater than the rotation ROM at every motion segment. The HAM demonstrated differences among motion segments and among movements. During flexion\extension, the helical axis of motion was directed nearly perpendicular to the sagittal plane for the C2-C3 through C7-T1 motion segments. During lateral bending, the angle between the HAM and the transverse plane progressively increased from the C6-C7 motion segment (approximately +/- 22 degrees) to the C3-C4 motion segment (approximately +/- 40 degrees). During axial rotation, the angle between the transverse plane and the HAM was approximately +/- 42 degrees at the C3-C4 through C5-C6 motion segments, and approximately +/- 32 degrees at the C6-C7 motion segment. This study provides valuable reference data for evaluating the effects of age, degeneration, and surgical procedures on cervical spine kinematics during three-dimensional dynamic functional loading. (C) 2015 Elsevier Ltd. All rights reserved.