A noninvasive, three-dimensional spinal motion analysis method
A noninvasive, three-dimensional spinal motion analysis method
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DOI：
10.1097/00007632-199709010-00011
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发表时间：
1997-09-01
期刊：
影响因子：
3
通讯作者：
Haughton, VM
中科院分区：
文献类型：
--
作者：
Lim, TH;Eck, JC;Haughton, VM
研究设计.通过监测每个脊椎主轴的方向，开发了一种三维无创运动分析方法。开发一种利用计算机断层扫描数据对脊柱进行三维无创运动分析的方法。背景资料概述。使用惯性矩张量的主轴来测量刚体的方向和位置的概念已经应用于腕关节和距下关节，但尚未应用于脊柱。方法.在不同的已知位置对两个单独的椎骨进行扫描。使用商业程序确定每次扫描的质心、面积、力矩和惯性积。定制软件使用平行轴定理组合数据，以给出每个椎骨的三维数据。质心和主轴的变化被用来计算平移和旋转？respectively.Results.系统旋转精度在1.0度以内，平移精度在1.0 mm以内。当使用较少的扫描次数时，在较小的运动中出现一些错误，系统分辨率为0.43 mm。已经开发了一种能够基于一系列计算机断层摄影图像的测量来计算三维脊柱运动的系统。该系统具有类似于目前的运动分析方法的准确性，但未来的研究将是必要的，在体内应用该系统。
Study Design. A three-dimensional, noninvasive motion analysis method was developed by monitoring the orientation of the principal axes of each vertebra.Objectives. To develop a method of performing three-dimensional, noninvasive motion analysis of the spine using computed tomography data.Summary of Background Data. The concept of using principal axes of the moment of inertia tensor to measure the orientation and position of a rigid body has been applied to the wrist and subtalar joints, but has not yet been applied to the spine. Methods. Scans were taken of two isolated vertebrae in various known positions. Centroids, area, moments, and product of inertia of each scan were determined using a commercial program. Custom software combined data using the parallel axis theorem to give three-dimensional data for each vertebra. Changes in the centroid and principal axes were used to calculate translation and rotation? respectively.Results. The system accuracy was within 1.0 degrees in rotation and 1.0 mm in translation. Some errors occurred in minor motions when a smaller number of scans were used System resolution was 0.43 mm.Conclusions. A system has been developed capable of calculating three-dimensional spinal motion based on measurements of a series of computed tomography images. The system has an accuracy similar to that of current motion analysis methods, but future studies will be necessary to apply this system in vivo.