Pothrat Claude, Goislard de Monsabert Benjamin, Vigouroux Laurent, Viehweger Elke, Berton Eric, Rao Guillaume
Aix-Marseille University, CNRS, ISM UMR 7287, 163 avenue de Luminy, 13288 Marseille cedex 09, France.
Aix-Marseille University, CNRS, ISM UMR 7287, 163 avenue de Luminy, 13288 Marseille cedex 09, France.
J Biomech. 2015 Oct 15;48(13):3716-9. doi: 10.1016/j.jbiomech.2015.07.044. Epub 2015 Aug 12.
Foot intrinsic motion originates from the combination of numerous joint motions giving this segment a high adaptive ability. Existing foot kinematic models are mostly focused on analyzing small scale foot bone to bone motions which require both complex experimental methodology and complex interpretative work to assess the global foot functionality. This study proposes a method to assess the total foot deformation by calculating a helical angle from the relative motions of the rearfoot and the forefoot. This method required a limited number of retro-reflective markers placed on the foot and was tested for five different movements (walking, forefoot impact running, heel impact running, 90° cutting, and 180° U-turn) and 12 participants. Overtime intraclass correlation coefficients were calculated to quantify the helical angle pattern repeatability for each movement. Our results indicated that the method was suitable to identify the different motions as different amplitudes of helical angle were observed according to the flexibility required in each movement. Moreover, the results showed that the repeatability could be used to identify the mastering of each motion as this repeatability was high for well mastered movements. Together with existing methods, this new protocol could be applied to fully assess foot function in sport or clinical contexts.
足部固有运动源于众多关节运动的组合，赋予该节段较高的适应能力。现有的足部运动学模型大多专注于分析小尺度的足部骨与骨之间的运动，这需要复杂的实验方法和复杂的解释工作来评估足部的整体功能。本研究提出了一种通过计算后足和前足的相对运动的螺旋角来评估足部整体变形的方法。该方法需要在足部放置数量有限的反光标记，并针对12名参与者的五种不同运动（行走、前足着地跑步、足跟着地跑步、90°转弯和180°掉头）进行了测试。计算了组内相关系数随时间的变化，以量化每种运动的螺旋角模式的重复性。我们的结果表明，该方法适合识别不同的运动，因为根据每种运动所需的灵活性观察到了不同幅度的螺旋角。此外，结果表明，重复性可用于识别对每种运动的掌握程度，因为对于熟练掌握的运动，这种重复性较高。与现有方法一起，这种新方案可应用于在运动或临床环境中全面评估足部功能。
