An Articulated Ankle-foot Orthosis with Adjustable Plantarflexion Resistance, Dorsiflexion Resistance and Alignment: A Pilot Study on Mechanical Properties and Effects on Stroke Hemiparetic Gait

Overview

Journal Med Eng Phys

Specialties Biomedical Engineering
Biophysics

Date 2017 Mar 13

PMID 28284572

Citations 11

Authors

Toshiki Kobayashi

Michael S Orendurff

Grace Hunt

Lucas S Lincoln

Fan Gao

Nicholas LeCursi

K Bo Foreman

Affiliations

Soon will be listed here.

Abstract

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.

Citing Articles

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A proposed evidence-guided algorithm for the adjustment and optimization of multi-function articulated ankle-foot orthoses in the clinical setting.

LeCursi N, Janka B, Gao F, Orendurff M, He Y, Kobayashi T Front Rehabil Sci. 2024; 5:1353303.

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Minimization of metabolic cost of transport predicts changes in gait mechanics over a range of ankle-foot orthosis stiffnesses in individuals with bilateral plantar flexor weakness.

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Advances on mechanical designs for assistive ankle-foot orthoses.

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Effect of a rigid ankle foot orthosis and an ankle foot orthosis with an oil damper plantar flexion resistance on pelvic and thoracic movements of patients with stroke during gait.

Ling H, Guo H, Zhou H, Chang X, Guo Z, Yamamoto S Biomed Eng Online. 2023; 22(1):9.

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