Muggleton J M, Allen R
Department of Mechanical Engineering, Southampton University, UK.
Med Eng Phys. 1998 Jan;20(1):21-32. doi: 10.1016/s1350-4533(97)00045-3.
In this discussion paper, vertebral translation in the sagittal plane is considered. A number of different measurement protocols are investigated and it is shown that, in general, the protocols lack a clear notion of the ideal. This can lead to difficulties when interpreting clinical data. One possible ideal is encapsulated in the concept of George's line, the posterior vertebral body alignment line. It is shown that translation can be measured such that deviations from George's line are quantified. Furthermore, an intrinsic centre of rotation is implied, and by considering translation in conjunction with intervertebral angle, inferences can be made regarding the position of the instantaneous centre of rotation of the joint. The relationship between static values of translation viewed on a single radiograph and changes in translation viewed across a number of images is also investigated. Results from some previous clinical studies are discussed in the light of the findings.
在本讨论文件中，考虑了矢状面内的椎体平移。研究了多种不同的测量方案，结果表明，一般而言，这些方案缺乏明确的理想概念。这可能会在解释临床数据时带来困难。一种可能的理想情况体现在乔治线（椎体后缘对线）的概念中。结果表明，可以测量平移，从而量化与乔治线的偏差。此外，还隐含着一个内在旋转中心，通过结合平移和椎间角度来考虑，可以推断关节瞬时旋转中心的位置。还研究了在单张X线片上观察到的平移静态值与在多张图像上观察到的平移变化之间的关系。根据这些发现，讨论了一些先前临床研究的结果。
