Burnfield Judith M, Eberly Valerie J, Gronely Joanne K, Perry Jacquelin, Yule William Jared, Mulroy Sara J
Madonna Rehabilitation Hospital, Lincoln, NE, USA.
Prosthet Orthot Int. 2012 Mar;36(1):95-104. doi: 10.1177/0309364611431611. Epub 2012 Jan 5.
Microprocessor controlled prosthetic knees (MPK) offer opportunities for improved walking stability and function, but some devices' swing phase features may exceed needs of users with invariable cadence. One MPK offers computerized control of only stance (C-Leg Compact).
To assess Medicare Functional Classification Level K2 walkers' ramp negotiation performance, function and balance while using a non-MPK (NMPK) compared to the C-Leg Compact.
Crossover.
Gait while ascending and descending a ramp (stride characteristics, kinematics, electromyography) and function were assessed in participant's existing NMPK and again in the C-Leg Compact following accommodation.
Ramp ascent and descent were markedly faster in the C-Leg Compact compared to the NMPK (p ≤ 0.006), owing to increases in stride length (p ≤ 0.020) and cadence (p ≤ 0.020). Residual limb peak knee flexion and ankle dorsiflexion were significantly greater (12.9° and 4.9° more, respectively) during single limb support while using the C-Leg Compact to descend ramps. Electromyography (mean, peak) did not differ significantly between prosthesis. Function improved in the C-Leg Compact as evidenced by a significantly faster Timed Up and Go and higher functional questionnaire scores.
Transfemoral K2 walkers exhibited significantly improved function and balance while using the stance-phase only MPK compared to their traditional NMPK.
微处理器控制的假肢膝关节（MPK）为改善行走稳定性和功能提供了机会，但一些设备的摆动期特征可能超出了步频不变的使用者的需求。有一种MPK仅提供对站立期的计算机控制（C-Leg Compact）。
与C-Leg Compact相比，评估医疗保险功能分级为K2级的步行者在使用非MPK（NMPK）时的坡道通过性能、功能和平衡能力。
交叉试验。
在参与者现有的NMPK上评估其上下坡道时的步态（步幅特征、运动学、肌电图）和功能，在适应C-Leg Compact后再次进行评估。
与NMPK相比，使用C-Leg Compact时上下坡道明显更快（p≤0.006），这是由于步长增加（p≤0.020）和步频增加（p≤0.020）。在使用C-Leg Compact下斜坡时，单腿支撑期间残肢的膝关节最大屈曲和踝关节背屈明显更大（分别多12.9°和4.9°）。两种假肢之间的肌电图（平均值、峰值）无显著差异。C-Leg Compact的功能有所改善，定时起立行走测试明显更快以及功能问卷得分更高证明了这一点。
与传统的NMPK相比，经股骨K2级步行者在使用仅具有站立期控制功能的MPK时，功能和平衡能力有显著改善。
