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首页> 外文期刊>BioMedical Engineering OnLine >Assessment of transfemoral amputees using a passive microprocessor-controlled knee versus an active powered microprocessor-controlled knee for level walking
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Assessment of transfemoral amputees using a passive microprocessor-controlled knee versus an active powered microprocessor-controlled knee for level walking

机译：使用被动微处理器控制的膝盖与主动供电的微处理器控制的膝盖进行经水平截肢的评估，以进行水平行走

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Background In transfemoral (TF) amputees, the forward propulsion of the prosthetic leg in swing has to be mainly carried out by hip muscles. With hip strength being the strongest predictor to ambulation ability, an active powered knee joint could have a positive influence, lowering hip loading and contributing to ambulation mobility. To assess this, gait of four TF amputees was measured for level walking, first while using a passive microprocessor-controlled prosthetic knee (P-MPK), subsequently while using an active powered microprocessor-controlled prosthetic knee (A-MPK). Furthermore, to assess long-term effects of the use of an A-MPK, a 4-weeks follow-up case study was performed. Methods The kinetics and kinematics of the gait of four TF amputees were assessed while walking with subsequently the P-MPK and the A-MPK. For one amputee, a follow-up study was performed: he used the A-MPK for 4?weeks, his gait was measured weekly. Results The range of motion of the knee was higher on both the prosthetic and the sound leg in the A-MPK compared to the P-MPK. Maximum hip torque (HT) during early stance increased for the prosthetic leg and decreased for the sound leg with the A-MPK compared to the P-MPK. During late stance, the maximum HT decreased for the prosthetic leg. The difference between prosthetic and sound leg for HT disappeared when using the A-MPK. Also, an increase in stance phase duration was observed. The follow-up study showed an increase in confidence with the A-MPK over time. Conclusions Results suggested that, partially due to an induced knee flexion during stance, HT can be diminished when walking with the A-MPK compared to the P-MPK. The single case follow-up study showed positive trends indicating that an adaptation time is beneficial for the A-MPK.
机译：背景技术在经股截截的截肢者中，假肢在挥杆中向前推进必须主要由臀部肌肉进行。髋部力量是移动能力的最强预测指标，活跃的主动式膝关节可能会产生积极影响，降低髋关节负荷并有助于移动能力。为了评估这一点，首先使用被动微处理器控制的假肢膝关节（P-MPK），然后使用有源动力微处理器控制的假肢膝关节（A-MPK），测量四个TF截肢者的步态。此外，为了评估使用A-MPK的长期效果，进行了为期4周的随访病例研究。方法评估四名TF截肢者步态的动力学和运动学，随后与P-MPK和A-MPK一起行走。对于一名截肢者，进行了一项后续研究：他使用A-MPK进行了4周，每周测量一次步态。结果与P-MPK相比，A-MPK的假肢和健全腿部的膝盖运动范围都更大。与P-MPK相比，使用A-MPK时，假肢的早期站立时最大髋部扭矩（HT）升高，而健全腿部的最大髋部扭矩下降。在后期姿势中，假肢的最大HT降低。使用A-MPK时，HT的假肢和声音腿之间的差异消失了。另外，观察到站立期持续时间增加。后续研究显示，随着时间的推移，人们对A-MPK的信心增强。结论结果表明，部分归因于站立过程中的膝盖弯曲，与P-MPK相比，使用A-MPK行走时HT可以降低。单例随访研究显示出积极的趋势，表明适应时间对A-MPK有益。

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