Kinematics and kinetics with an adaptive ankle foot system during stair ambulation of transtibial amputees
Kinematics and kinetics with an adaptive ankle foot system during stair ambulation of transtibial amputees
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DOI：
10.1016/j.gaitpost.2009.06.009
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发表时间：
2009-10-01
期刊：
影响因子：
2.4
通讯作者：
Wolf, Sebastian I.
中科院分区：
文献类型：
--
作者：
Alimusaj, Merkur;Fradet, Laetitia;Wolf, Sebastian I.
传统的假肢脚不能适应特定的条件，比如在楼梯或斜坡上行走。因此，截肢者被迫通过改变其下肢的运动学和动力学来补偿其假肢的缺陷。Proprio-Foot (TM) （Ossur）打算通过自适应微处理器控制的脚踝，在楼梯行走过程中自动增加背屈来减少这些补偿机制。本研究旨在分析跨胫截肢者在楼梯行走时背屈适应的生物力学效应。16名TT截肢者和16名健康对照者进行常规3D步态分析。将假肢脚设置为中性踝关节角度和踝关节背屈角度为4度的患者在上楼梯和下楼梯时下肢的运动学和动力学进行比较。计算标准距离以及矢状位运动学和动力学的最小值和最大值，以便在患者和对照组之间进行比较。上下楼梯均可使用。膝关节运动学和动力学的改善可以特别注意到在涉及的一方，增加膝关节屈曲和增加膝盖的时刻在立场。因此，尽管与传统的假肢踝关节相比，本体足（TM）有额外的重量，但对于膝关节肌肉力量不构成障碍的主动TT截肢者来说，它应该是有益的。(C) 2009 Elsevier B.V.版权所有
Conventional prosthetic feet cannot adapt to specific conditions Such as walking on stairs or ramps. Amputees are therefore forced to compensate their prosthetic deficits by modifying the kinematics and kinetics of their lower limbs. The Proprio-Foot (TM) (Ossur) intends to reduce these compensation mechanisms by automatically increasing dorsiflexion during stair ambulation thanks to an adaptive microprocessor-control led ankle. The present investigation proposes to analyze the biomechanical effects of the dorsiflexion adaptation in transtibial (TT) amputees during stair ambulation.Sixteen TT amputees and sixteen healthy controls underwent conventional 3D gait analysis. Kinematics and kinetics of the lower limbs were compared during stair ascent and descent performed by patients with the prosthetic foot set to a neutral ankle angle and with an adapted dorsiflexion ankle angle of 4 degrees. Norm distance as well as minimum and maximal values of sagittal kinematics and kinetics were calculated for comparisons between patients and control subjects.For both stair ascent and descent. an improvement of the knee kinematics and kinetics could particularly be noticed on the involved side with an increase of the knee flexion and an increase of the knee moment during stance.Therefore, despite its additional weight compared to a conventional prosthetic ankle, the Proprio-Foot (TM) Should be beneficial to active TT amputees whose knee musculature strength does not constitute a handicap. (C) 2009 Elsevier B.V. All rights reserved.