Sensitivity, reliability and accuracy of the instant center of rotation calculation in the cervical spine during in vivo dynamic flexion-extension.
Sensitivity, reliability and accuracy of the instant center of rotation calculation in the cervical spine during in vivo dynamic flexion-extension.
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DOI：
10.1016/j.jbiomech.2012.11.055
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发表时间：
2013-02-22
影响因子：
2.4
通讯作者：
Anderst WJ
中科院分区：
文献类型：
--
作者：
Baillargeon E;Anderst WJ
瞬时旋转中心（ICR）已被提议作为活动度（ROM）的替代，用于评价颈椎运动的质量，而不是数量。本研究的目的是评估在动态体内运动过程中获得的颈椎ICR路径计算的灵敏度、可靠性和准确性。通过评价运动方向（屈曲与伸展）、旋转步长、滤波器频率和运动跟踪误差的影响，评估了体内颈椎ICR计算的可靠性和灵敏度。ICR路径计算的准确性进行了评估，通过模拟实验，复制在体内运动的颈椎。体内评估包括20名无症状受试者，他们进行连续的头部屈曲-伸展运动，同时以30帧/秒的速度收集双平面X线片。使用基于体积模型的跟踪技术，以亚毫米精度跟踪C2至C7颈椎的体内运动。采用有限螺旋轴法确定相邻椎体间的ICRs。体内实验结果表明，在屈曲运动和伸展运动期间，ICR路径没有不同。在体内，ICR的路径可以可靠地表征为SI方向上的0.5 mm和AP方向上的1.0 mm。ICR位置的受试者间变异性在SI方向上平均为±1.2 mm，在AP方向上平均为±2.2 mm。计算实验估计ICR定位的体内精度在1.1 mm和3.1 mm之间。
The instant center of rotation (ICR) has been proposed as an alternative to range of motion (ROM) for evaluating the quality, rather than the quantity, of cervical spine movement. The purpose of the present study was to assess the sensitivity, reliability and accuracy of cervical spine ICR path calculations obtained during dynamic in vivo movement. The reliability and sensitivity of in vivo cervical spine ICR calculations were assessed by evaluating the effects of movement direction (flexion versus extension), rotation step size, filter frequency, and motion tracking error. The accuracy of the ICR path calculations was assessed through a simulation experiment that replicated in vivo movement of cervical vertebrae. The in vivo assessment included 20 asymptomatic subjects who performed continuous head flexion-extension movements while biplane radiographs were collected at 30 frames/s. In vivo motion of C2 through C7 cervical vertebrae was tracked with sub-millimeter accuracy using a volumetric model-based tracking technique. The finite helical axis method was used to determine ICRs between each pair of adjacent vertebra. The in vivo results indicate ICR path is not different during the flexion movement and the extension movement. In vivo, the path of the ICR can reliably be characterized within 0.5 mm in the SI and 1.0 mm in the AP direction. The inter-subject variability in ICR location averaged ±1.2 mm in the SI direction and ±2.2 mm in the AP direction. The computational experiment estimated the in vivo accuracy in ICR location was between 1.1 mm and 3.1 mm.
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DOI：
10.1056/nejmoa0901249
发表时间：
2009-08-27
期刊：
The New England journal of medicine
影响因子：
--
作者：
Fazel R;Krumholz HM;Wang Y;Ross JS;Chen J;Ting HH;Shah ND;Nasir K;Einstein AJ;Nallamothu BK
通讯作者：
Nallamothu BK
DOI：
10.1115/1.2206199
发表时间：
2006-08-01
影响因子：
1.7
作者：
Bey, Michael J.;Zauel, Roger;Tashman, Scott
通讯作者：
Tashman, Scott
影响因子：
1.8
作者：
Frobin, W;Leivseth, G;Brinckmann, P
通讯作者：
Brinckmann, P
影响因子：
2.2
作者：
Anderst, William;Zauel, Roger;Tashman, Scott
通讯作者：
Tashman, Scott
验证非侵入性技术以精确测量体内三维颈椎运动。
影响因子：
3
作者：
Anderst WJ;Baillargeon E;Donaldson WF 3rd;Lee JY;Kang JD
通讯作者：
Kang JD