QUANTIFICATION OF 3-DIMENSIONAL VERTEBRAL ROTATIONS IN SCOLIOSIS - WHAT ARE THE TRUE VALUES
QUANTIFICATION OF 3-DIMENSIONAL VERTEBRAL ROTATIONS IN SCOLIOSIS - WHAT ARE THE TRUE VALUES
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DOI：
10.1097/00007632-199503010-00008
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发表时间：
1995-03-01
期刊：
影响因子：
3
通讯作者：
DESCRIMES, JL
中科院分区：
文献类型：
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作者：
SKALLI, W;LAVASTE, F;DESCRIMES, JL
研究设计.本研究的目的是量化空间三维旋转及其计算值之间的差异，无论是在二维投影（射线照片或计算机断层扫描）或三维计算使用各种数学程序。使用椎骨模型，使用二维投影或各种三维数学程序来量化三维旋转与其计算值之间的差异。方法。一个特定的程序允许我们使用给定的侧向、矢状和轴向旋转值和序列在空间中移动几何椎骨模型。将由于不同序列引起的位置差异可视化并定量。考虑了由于绕整体或椎体轴旋转引起的差异。对于约10度的旋转，三维角度与投影角度之间的差约为2度。当联合旋转较大时，差异会增加，这通常发生在脊柱侧凸脊柱中。侧向和矢状旋转30 °时，它们可倾斜16 °。在横位投影上测量的轴向旋转对于在空间旋转的椎骨是误导性的。此外，只有在给出所用的数学约定的情况下，处理大的三维旋转才有意义。
Study Design. The aim of this study is to quantify differences between three-dimensional rotations in space and their calculated values, either on two-dimensional projections (radiographs or computed tomographic scans) or three-dimensional calculations using various mathematical procedures.Objective. To use a vertebral model to quantify differences between three-dimensional rotations and their calculated values, using two-dimensional projections or various three-dimensional mathematical procedures.Methods. A specific program allowed us to move a geometric vertebral model in space using given values and sequences of lateral, sagittal, and axial rotations. Differences in positions due to different sequences were visualized and quantified. Differences due to rotation around global or vertebral axes were considered.Results. For rotations of about 10 degrees, differences are about 2 degrees between three-dimensional and projected angles. Differences increase when combined rotations are large, as generally occurs in a scoliotic spine. They leach 16 degrees for lateral and sagittal rotations of 30 degrees.Conclusion. Axial rotation measured on transverse projection is misleading for vertebrae rotated in space. Moreover, dealing with targe three-dimensional rotations is meaningful only if the used mathematical convention is given.