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首页> 外文期刊>Gait & posture >Errors in measuring sagittal arch kinematics of the human foot with digital fluoroscopy.
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Errors in measuring sagittal arch kinematics of the human foot with digital fluoroscopy.

机译：用数字荧光检查法测量人脚的矢状弓运动学时的错误。

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Although fluoroscopy has been used to evaluate motion of the foot during gait, the accuracy and precision of fluoroscopic measures of osseous structures of the foot has not been reported in the literature. This study reports on a series of experiments that quantify the magnitude and sources of error involved in digital fluoroscopic measurements of the medial longitudinal arch. The findings indicate that with a global distortion correction procedure, errors arising from image distortion can be reduced threefold to 0.2 degrees for angular measurements and to 0.1 mm for linear measures. The limits of agreement for repeated angular measures of the calcaneus and first metatarsal were +/-0.5 degrees and +/-0.6 degrees , indicating that measurement error was primarily associated with the manual process of digitisation. While the magnitude of the residual error constitutes about +/-2.5% of the expected 20 degrees of movement of the calcaneus and first metatarsal, out-of-plane rotation may potentially contribute the greatest source of error in fluoroscopic measures of the foot. However, even at the extremes of angular displacement (15 degrees ) reported for the calcaneum during running gait, the root mean square (RMS) error was only about 1 degrees . Thus, errors associated with fluoroscopic imaging of the foot appear to be negligible when compared to those arising from skin movement artefact, which typically range between 1.5 and 4 mm (equating to errors of 2 degrees to 17 degrees for angular measures). Fluoroscopy, therefore, may be a useful technique for analysing the sagittal movement of the medial longitudinal arch during the contact phase of walking.
机译：尽管荧光检查法已被用于评估步态期间足部的运动，但是文献中尚未报道过荧光检查法对足骨结构的准确性和精确性。这项研究报告了一系列实验，这些实验量化了内侧纵弓的数字荧光检查所涉及的误差的大小和来源。研究结果表明，使用整体失真校正程序，可以将因图像失真而产生的误差减少三倍，对于角度测量来说可以降低到0.2度，对于线性测量可以降低到0.1毫米。跟骨和first骨的重复角度测量的一致极限为+/- 0.5度和+/- 0.6度，表明测量误差主要与手动数字化过程相关。尽管残余误差的大小占跟骨和第一meta骨的预期20度运动角度的大约+/- 2.5％，但平面外旋转可能会导致脚部透视检查中的最大误差来源。但是，即使在跑步步态中跟骨的角位移为极端（15度）时，均方根（RMS）误差也仅为1度左右。因此，与由皮肤运动伪影引起的错误相比，与脚部荧光成像相关的误差似乎可以忽略不计，该误差通常在1.5到4 mm之间（对于角度测量，等于2度到17度）。因此，荧光检查可能是一种有用的技术，可用于分析步行接触阶段中内侧纵弓的矢状运动。

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