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首页> 外文期刊>Journal of Biomechanics >The effect of rotational speed on ankle-foot orthosis properties
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The effect of rotational speed on ankle-foot orthosis properties

机译：转速对踝足矫形性能的影响

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Ankle-foot orthoses (AFOs) are devices that support ankle motion. An AFO's sagittal plane rotational stiffness can affect gait kinematics. Because AFOs are often made from viscoelastic materials, their properties may vary at different walking speeds. The influence of rotational speed on AFO properties has not been thoroughly investigated. Therefore, the purpose of this study was to determine the impact of rotational speed on AFO stiffness about the ankle. We tested a sample of one thermoplastic off-the-shelf AFO and two 3-D printed carbon fiber enforced nylon AFOs. Each AFO's dynamic resistance torque was measured as it was flexed at five speeds (5 - 100 degrees/s) using a custom-built measurement apparatus. We compared loading stiffness, neutral angle, and energy dissipation parameters for each AFO across speeds. Parameter values were generally greater at higher speeds. These effects were statistically significant for all AFOs (p <= 0.002). However, differences in AFO stiffness and neutral angle across speeds were quite small (< 0.6 NM degrees and < 2.2 degrees). Changes in the thermoplastic AFO's stiffness were lower than the minimum detectable difference. Energy dissipation, as indicated by hysteresis area, increased by up to 6.3 J (about 250%) at the highest speed. This demonstrates that AFO flexion speed can influence the properties of different AFOs over the range typically achieved in human walking. Future work should assess whether the observed small variations of stiffness and neutral angle have a clinically meaningful impact on user performance, as well as explore effects of angular speed on a variety of AFO materials and designs. (C) 2021 Elsevier Ltd. All rights reserved.
机译：踝足矫形器（AFOs）是支持脚踝运动的设备。AFO的矢状面旋转刚度会影响步态运动学。因为AFO通常由粘弹性材料制成，所以在不同的行走速度下，它们的性能可能会有所不同。转速对AFO性能的影响尚未被彻底研究。因此，本研究的目的是确定旋转速度对踝关节AFO刚度的影响。我们测试了一个现成的热塑性AFO和两个3D打印碳纤维增强尼龙AFO样品。每个AFO的动态阻力扭矩都是在五种速度（5-100度/秒）下弯曲时使用定制的测量装置测量的。我们比较了不同速度下每个AFO的负载刚度、中性角和能量耗散参数。速度越高，参数值通常越大。所有AFO的这些影响均具有统计学意义（p<=0.002）。然而，AFO刚度和中性角在不同速度下的差异非常小（<0.6 NM度和<2.2度）。热塑性AFO硬度的变化低于最小可检测差异。如磁滞面积所示，能量耗散在最高速度下增加了6.3 J（约250%）。这表明，AFO屈曲速度可以影响不同AFO在人类步行中通常达到的范围内的性能。未来的工作应评估观察到的刚度和中性角的微小变化是否对用户性能有临床意义的影响，并探索角速度对各种AFO材料和设计的影响。（c）2021爱思唯尔有限公司保留所有权利。

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