Kobayashi Toshiki, Orendurff Michael S, Hunt Grace, Lincoln Lucas S, Gao Fan, LeCursi Nicholas, Foreman K Bo
Department of Prosthetics and Orthotics, Faculty of Health Sciences, Hokkaido University of Science, 7-15-4-1 Maeda, Teine, Sapporo, Hokkaido 006-8585, Japan ; Orthocare Innovations, Mountlake Terrace, WA, USA.
Orthocare Innovations, Mountlake Terrace, WA, USA; Lucille Packard Children's Hospital, Stanford University, Motion & Sports Performance Laboratory, Palo Alto, CA, USA.
Med Eng Phys. 2017 Jun;44:94-101. doi: 10.1016/j.medengphy.2017.02.012. Epub 2017 Mar 9.
Mechanical properties of an articulated ankle-foot orthosis (AFO) are closely related to gait performance in individuals post-stroke. This paper presents a pilot study on the mechanical properties of a novel articulated AFO with adjustable plantarflexion resistance, dorsiflexion resistance and alignment, and its effect on ankle and knee joint kinematics and kinetics in an individual post-stroke during gait. The mechanical properties of the AFO were quantified. Gait analysis was performed using a 3D motion capture system with a split-belt instrumented treadmill under 12 different settings of the mechanical properties of the AFO [i.e. 4 plantarflexion resistances (P1<P4), 4 dorsiflexion resistances (D1<D4), 4 initial alignments (A1<A4)]. The AFO demonstrated systematic changes in moment-angle relationship in response to changes in AFO joint settings. The gait analysis demonstrated that the ankle and knee angle and moment were responsive to changes in the AFO joint settings. Mean ankle angle at initial contact changed from -0.86° (P1) to 0.91° (P4) and from -1.48° (A1) to 4.45° (A4), while mean peak dorsiflexion angle changed from 12.01° (D1) to 6.40° (D4) at mid-stance. The novel articulated AFO appeared effective in influencing lower-limb joint kinematics and kinetics of gait in the individual post-stroke.
铰接式踝足矫形器（AFO）的力学性能与中风后个体的步态表现密切相关。本文介绍了一项关于新型铰接式AFO力学性能的初步研究，该AFO具有可调节的跖屈阻力、背屈阻力和对线，并研究了其对中风后个体在步态期间踝关节和膝关节运动学及动力学的影响。对AFO的力学性能进行了量化。使用带有分体式皮带测力跑步机的三维运动捕捉系统，在AFO的12种不同力学性能设置下（即4种跖屈阻力（P1<P4）、4种背屈阻力（D1<D4）、4种初始对线（A1<A4））进行了步态分析。AFO在响应AFO关节设置变化时，力矩-角度关系呈现出系统性变化。步态分析表明，踝关节和膝关节角度及力矩对AFO关节设置的变化有响应。初始接触时的平均踝关节角度从-0.86°（P1）变为0.91°（P4），从-1.48°（A1）变为4.45°（A4），而平均峰值背屈角度在步态中期从12.01°（D1）变为6.40°（D4）。新型铰接式AFO似乎能有效影响中风后个体下肢关节的步态运动学和动力学。
