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首页> 外文期刊>Journal of Rehabilitation Research and Development >The biomechanical response of persons with transfemoral amputation tovariations in prosthetic knee alignment during level walking
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The biomechanical response of persons with transfemoral amputation tovariations in prosthetic knee alignment during level walking

机译：经股截肢的人对水平行走过程中假肢膝部对齐变化的生物力学响应

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Prosthetic alignment is an important factor in theoverall fit and performance of a lowerlimb prosthesis. However,the association between prosthetic alignment and control strategiesused by persons with transfemoral amputation to coordinatethe movement of a passive prosthetic knee is poorly understood.This study investigated the biomechanical response of personswith transfemoral amputation to systematic perturbations inknee joint alignment during a level walking task. Quantitativegait data were collected for three alignment conditions benchalignment, 2 cm anterior knee translation (ANT), and 2 cm posteriorknee translation (POST). In response to a destabilizingalignment perturbation (i.e., the ANT condition), participantssignificantly increased their earlystance hip extension moment,confirming that persons with transfemoral amputation rely on ahip extensor strategy to maintain knee joint stability. However,participants also decreased the rate at which they loaded theirprosthesis, decreased their affectedside step length, increasedtheir trunk flexion, and maintained their prosthesis in a morevertical posture at the time of opposite toe off. Collectively, theseresults suggest that persons with transfemoral amputation relyon a combination of strategies to coordinate stancephase kneeflexion. Further, comparatively few significant changes wereobserved in response to the POST condition, suggesting that abias toward posterior alignment may have fewer implications interms of stancephase, knee joint control.
机译：假体对准是下肢假体的整体配合和性能的重要因素。然而，人们很少了解经股截肢者用来协调被动假肢膝关节运动的假体对准与控制策略之间的关系。本研究调查了在水平行走任务中经股截肢者对系统性扰动膝关节对准的生物力学反应。收集了三种对准条件的卧推，2 cm前膝关节平移（ANT）和2 cm后膝关节平移（POST）的定量步态数据。为了应对不稳定的对位扰动（即ANT条件），参与者显着增加了早期髋关节伸展力矩，从而确定经股截肢的患者依靠髋关节伸肌策略来维持膝关节稳定性。但是，参与者在脚趾对立时也降低了他们的假体加载速度，减少了受影响的步长，增加了他们的躯干屈曲以及将他们的假体保持在更垂直的姿势。总体而言，这些结果表明经股截肢的人依靠多种策略来协调站姿膝关节屈曲。此外，相对于POST条件观察到的相对较少的显着变化，表明向后对齐的偏斜可能在姿态阶段，膝关节控制方面影响较小。

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