Frontal plane roll-over analysis of prosthetic feet.
Frontal plane roll-over analysis of prosthetic feet.
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DOI：
10.1016/j.jbiomech.2021.110610
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发表时间：
2021-08-26
影响因子：
2.4
通讯作者：
Otten E
中科院分区：
文献类型：
--
作者：
van Hal ES;Curtze C;Postema K;Hijmans JM;Otten E
在假肢行走中，由于缺乏主动踝关节控制，通过假肢中的力矩，内外平衡受到损害。主动控制被简化为髋关节策略，而被动机械稳定性取决于负载下假足的曲率。假足的内外侧翻转曲率在很大程度上是未知的。在这项研究中，我们确定了各种假肢脚和脚鞋组合的内外侧翻转特性。特征通过倒置的类螺旋管装置来确定。测量压力中心（CoP）和柄部角度之间的关系，并将其转换为翻转形状和有效曲率半径。此外，滞后（即，由滞后曲线确定垂直柄角处的CoP位移滞后（由于材料柔量或滑动）。被动机械稳定性变化很大，虽然所有测量的脚鞋组合相对顺应。CoP的内外侧运动范围在4mm和40mm之间，从而在每只脚的物理宽度内保持良好。导出的翻转曲率半径也很小，平均为102 mm。滞后范围在总CoP位移的20%到115%之间，并且在添加鞋时变得更加明显。这可能是由于脚芯在其装饰罩中滑动，或者脚在鞋中滑动。滑动可能通过限制CoP的内外侧行进而不利于平衡控制。因此，在假肢足设计中消除内外侧滑动可能具有临床意义。
In prosthetic walking mediolateral balance is compromised due to the lack of active ankle control, by moments of force, in the prosthetic limb. Active control is reduced to the hip strategy, and passive mechanical stability depends on the curvature of the prosthetic foot under load. Mediolateral roll-over curvatures of prosthetic feet are largely unknown. In this study we determined the mediolateral roll-over characteristics of various prosthetic feet and foot-shoe combinations. Characteristics were determined by means of an inverted pendulum-like apparatus. The relationship between the centre of pressure (CoP) and the shank angle was measured and converted to roll-over shape and effective radius of curvature. Further, hysteresis (i.e., lagging in CoP displacement due to material compliance or slip) at vertical shank angle was determined from the hysteresis curve. Passive mechanical stability varied widely, though all measured foot-shoe combinations were relatively compliant. Mediolateral motion of the CoP ranged between 4mm and 40mm, thereby remaining well within each foot’s physical width. Derived roll-over radii of curvature are also small, with an average of 102mm. Hysteresis ranges between 20% and 115% of total CoP displacement and becomes more pronounced when adding a shoe. This may be due to slipping of the foot core in its cosmetic cover, or the foot in the shoe. Slip may be disadvantageous for balance control by limiting mediolateral travel of the CoP. It may therefore be clinically relevant to eliminate mediolateral slip in prosthetic foot design.
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DOI：
10.1098/rstb.1999.0439
发表时间：
1999-05-29
影响因子：
6.3
作者：
Otten, E
通讯作者：
Otten, E
影响因子：
2.4
作者：
Lansink, I. L. B. Oude;van Kouwenhove, L.;Hijmans, J. M.
通讯作者：
Hijmans, J. M.
影响因子：
2.4
作者：
Hof, At L.
通讯作者：
Hof, At L.
影响因子：
2.2
作者：
Curtze, Carolin;Hof, At L.;Otten, Bert
通讯作者：
Otten, Bert
影响因子：
1.8
作者：
Hansen, AH;Childress, DS;Knox, EH
通讯作者：
Knox, EH