The signed helical angle: A technique for characterizing midfoot motion during gait
The signed helical angle: A technique for characterizing midfoot motion during gait
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DOI：
10.1016/j.jbiomech.2023.111791
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发表时间：
2023-09-19
影响因子：
2.4
通讯作者：
Bruening，Dustin A.
中科院分区：
文献类型：
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作者：
Bassett，Kirk E.;Charles，Steven K.;Bruening，Dustin A.
在步态和其他运动期间量化中足的运动对于各种应用是重要的，但是由于涉及的多个小关节的复杂性而具有挑战性。最常见的基于运动捕捉的技术在其表征中足关节轴的非平面性质的能力方面是有限的。在这项研究中，我们开发了一种新的符号螺旋角（SHA）来量化中足角位移。运动捕捉数据从40名健康受试者步行在一个控制的速度被用来计算有限的螺旋轴和角度从一个两段脚模型。轴根据其方向分为旋前或旋后，并给出一个符号，从而增加或减少角位移。分析集中在轴方向的见解和与其他技术的比较。结果表明，当过渡被排除在外，旋前和旋后轴是相当好的集群在横向平面。产生的SHA中足角度波形与矢状面欧拉和螺旋分量波形相当，但由于运动路径的直接测量和其他平面的影响，旋前运动范围大39%（约3°），旋后运动范围大25%（约4°）。所提出的SHA方法可以提供一种直观且有用的方法来分析用于各种应用的中足运动，特别是当干预引起可能在平面分析中被稀释的细微变化时。
Quantifying motion in the midfoot during gait and other movements is important for a variety of applications, but challenging due to the complexity of the multiple small articulations involved. The most common motion capture based techniques are limited in their ability to characterize the non-planar nature of the midfoot joint axes. In this study we developed a novel Signed Helical Angle (SHA) to quantify midfoot angular displacement. Motion capture data from 40 healthy subjects walking at a controlled speed were used to calculate finite helical axes and angles from a two-segment foot model. Axes were classified as either pronation or supination based on their orientation, and given a sign, thus either adding to or subtracting from the angular displacement. Analysis focused on insights from axis orientation and comparisons to other techniques. Results showed that when transitions were excluded, pronation and supination axes were fairly well clustered in the transverse plane. The resulting SHA midfoot angle waveform was comparable to sagittal plane Euler and helical component waveforms, but with 39% (approximately 3°) greater range of motion in pronation and 25% (approximately 4°) greater in supination, due to the direct measurement of the motion path and the influence of the other planes. The proposed SHA method may provide an intuitive and useful method to analyze midfoot motion for a variety of applications, particularly when interventions cause subtle changes that may be diluted in planar analyses.