Evaluation of a powered ankle-foot prosthesis during slope ascent gait

Passive prosthetic feet lack active plantarflexion and push-off power resulting in gait deviations and compensations by individuals with transtibial amputation (TTA) during slope ascent. We sought to determine the effect of active ankle plantarflexion and push-off power provided by a powered prosthetic ankle-foot (PWR) on lower extremity compensations in individuals with unilateral TTA as they walked up a slope. We hypothesized that increased ankle plantarflexion and push-off power would reduce compensations commonly observed with a passive, energy-storing-returning prosthetic ankle-foot (ESR). We compared the temporal spatial, kinematic, and kinetic measures of ten individuals with TTA (age: 30.2 ± 5.3 yrs) to matched abled-bodied (AB) individuals during 5° slope ascent. The TTA group walked with an ESR and separately with a PWR. The PWR produced significantly greater prosthetic ankle plantarflexion and push-off power generation compared to an ESR and more closely matched AB values. Th...

被动式假肢脚缺乏主动跖屈与蹬地功率，会导致经胫骨截肢（transtibial amputation, TTA）患者在爬坡过程中出现步态异常与代偿动作。本研究旨在探究主动式假肢踝足（powered prosthetic ankle-foot, PWR）提供的主动踝关节跖屈与蹬地功率，对单侧经胫骨截肢患者爬坡时下肢代偿动作的影响。我们假设，相较于被动储能回馈型假肢踝足（energy-storing-returning prosthetic ankle-foot, ESR），提升踝关节跖屈与蹬地功率可减少此类常见代偿行为。本研究对比了10名经胫骨截肢受试者（年龄：30.2±5.3岁）分别佩戴ESR与PWR时的时空参数、运动学与动力学指标，并与匹配的健全受试者（abled-bodied, AB）在5°坡度爬坡时的对应指标进行对比。结果显示，相较于ESR，PWR可产生显著更高的假肢踝关节跖屈与蹬地功率，且其相关数值更接近健全受试者水平。（原文后续内容截断）