School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA.
Center for the Intrepid, San Antonio, TX, USA.
Prosthet Orthot Int. 2021 Oct 1;45(5):410-416. doi: 10.1097/PXR.0000000000000036.
Increased knee osteoarthritis risk in patients with unilateral lower extremity limb loss is attributed to increased intact limb loading. Modulating powered ankle prosthesis push-off power may be an effective way to modulate intact limb loading. We examined how changes in the parameter settings of a commercial prosthetic ankle affect power delivery during push-off and the resulting collisional work experienced by the intact limb in persons with unilateral lower extremity limb loss.
Five subjects with unilateral transtibial amputation were fitted with a commercially available powered ankle prosthesis (Ottobock Empower). Subjects walked on a treadmill in seven conditions, where ankle power delivery settings were adjusted using methods accessible to clinicians. Kinetics and kinematics data were collected.
Standard adjustment of parameter settings within the prosthetic foot did not alter timing of peak prosthesis power or intact limb collisional work but did have a significant effect on the magnitude of positive prosthesis ankle work. Increased prosthesis work did not decrease intact limb collisional work as predicted.
Altering the parameter settings on a commercial powered ankle prosthesis affected the magnitude, but not the timing, of power delivered. Increased prosthesis push-off power did not decrease intact limb loading.
单侧下肢截肢患者的膝关节骨关节炎风险增加归因于完整肢体负重增加。调节动力踝足假肢的蹬离功率可能是调节完整肢体负重的有效方法。我们研究了商业踝足假肢的参数设置变化如何影响蹬离过程中的功率输出，以及单侧下肢截肢患者完整肢体所经历的碰撞功的变化。
5 名单侧胫骨截肢患者配备了一款商业动力踝足假肢（奥托博克 Empower）。受试者在跑步机上以七种不同条件行走，通过临床医生可获得的方法调整踝足假肢的功率输出设置。收集动力学和运动学数据。
假肢足内的参数设置的标准调整并未改变峰值假肢功率或完整肢体碰撞功的时间，但对正的假肢踝关节功的大小有显著影响。正如预测的那样，增加假肢功率并没有减少完整肢体的碰撞功。
改变商业动力踝足假肢的参数设置会影响功率输出的大小，但不会影响其时间。增加假肢蹬离功率并没有减少完整肢体的负重。
