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首页> 外文期刊>Gait & posture >Effective rocker shapes used by able-bodied persons for walking and fore-aft swaying: implications for design of ankle-foot prostheses.
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Effective rocker shapes used by able-bodied persons for walking and fore-aft swaying: implications for design of ankle-foot prostheses.

机译：健壮的人用于步行和前后摇摆的有效摇杆形状：对脚踝假体设计的影响。

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摘要

The use of rocker models to understand functional tasks of the human lower limb is attractive because of their simplicity. Recent studies have determined a consistent feature of able-bodied walking termed the roll-over shape (ROS), which is the effective rocker shape that the lower limb system conforms to between initial contact and contralateral initial contact during walking. However, it is unclear what effective rocker shapes are used for fore-aft swaying. A better understanding of these shapes could be used to develop improved prostheses for this task, perhaps improving balance and balance confidence, and reducing the occurrence of falling in lower limb prosthesis users. We measured effective rocker shapes used by 11 able-bodied persons during walking and fore-aft swaying. We hypothesized that the curvature of the swaying shapes would be smaller (radius larger) than that of the walking shapes, providing a more stable interface with the ground during swaying. The radius (measured as the inverse of the curvature of the shape) was found to be about 1/3 of the leg length for walking, but over two times the leg length for swaying. A model examining the effective ankle stiffness necessary to achieve these curvatures suggests that the stiffness of a biomimetic prosthetic ankle would need to be over three times higher for fore-aft swaying than for walking. These results suggest that two separate modes would be needed in an ankle-foot prosthesis to mimic the physiologic system for walking and swaying.
机译：使用摇杆模型来理解人类下肢的功能任务很有吸引力，因为它们简单。最近的研究确定了健壮步行的一致特征，称为侧翻形状（ROS），这是下肢系统在步行过程中初始接触与对侧初始接触之间符合的有效摇杆形状。然而，不清楚哪种有效的摇杆形状用于前后摇摆。对这些形状的更好理解可用于开发完成此任务的假体，也许可以改善平衡和平衡信心，并减少下肢假体使用者跌倒的发生。我们测量了11名健壮的人在步行和前后摇摆中使用的有效摇杆形状。我们假设摇摆形状的曲率会比步行形状的曲率小（半径大），从而在摇摆过程中提供与地面的更稳定的界面。半径（以形状的曲率的倒数来衡量）约为步行时腿长的1/3，但超过摇摆时腿长的两倍。一个检查实现这些曲率所必需的有效脚踝刚度的模型表明，仿生假肢脚踝的刚度对于前向摇摆比对步行要高三倍以上。这些结果表明，在脚踝假体中需要两种单独的模式来模仿步行和摇摆的生理系统。

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