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首页> 外文期刊>Journal of Biomechanics >Calculating the 2-D motion of lumbar vertebrae using splines
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Calculating the 2-D motion of lumbar vertebrae using splines

机译：使用样条线计算腰椎的二维运动

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A recently published article (McCane et al., 2006) presented a new protocol to determine sagittal plane segmental rotational motion from plane views of the lumbar spine taken in flexion and extension. Independently in each lateral view, contours of the vertebral bodies were represented by splines. The pairs of splines from both views were then matched by an iterative procedure so that relative rotation of the vertebrae could be calculated in a third step. From an in vitro study, the authors determined an error of the rotational motion measurement of 0.44 + 0.45? this error being lower than the respective error obtained by previous protocols, specifically by Distortion Compensated Roentgen Analysis (DCRA: Brinckmann et al., 1994; Frobin et al., 1996). While McCane and colleagues present an ingenious method to represent a plane shape by closed splines and to match splines with different parameterizations, we wish to point to the conceptual problems of their approach when taking measurements of vertebral contours from conventional, clinical radiographs.#1 Dollars 1001N200307031Dollars 1200
机译：最近发表的一篇文章（McCane等人，2006）提出了一种新的协议，可以从在屈曲和伸展时得到的腰椎平面图中确定矢状平面节段的旋转运动。在每个侧视图中，椎体的轮廓均由样条曲线表示。然后，通过迭代过程匹配来自两个视图的样条线对，以便可以在第三步中计算椎骨的相对旋转。通过一项体外研究，作者确定旋转运动测量的误差为0.44 + 0.45？该误差低于通过先前的协议，特别是通过畸变补偿的伦琴分析（DCRA：Brinckmann等，1994; Frobin等，1996）获得的相应误差。虽然McCane及其同事提出了一种巧妙的方法来用闭合的样条曲线表示平面形状，并用不同的参数化参数来匹配样条曲线，但我们还是希望从常规的临床X射线照片测量椎骨轮廓时指出其方法的概念性问题。 1001N200307031美元1200

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