Comparison of Two Design Principles of Unpowered Ankle-Foot Orthoses for Supporting Push-Off: A Case Study

Cristina Bayon*, Nikko Van Crey, Eduardo Rocon, Elliott Rouse, Edwin van Asseldonk

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

Ankle propulsion is essential for efficient human walking. In recent years, several working principles have been investigated and applied to ankle-foot orthoses (AFOs) to enhance the work of the plantarflexor muscles and achieve proper propulsion during gait. Comparing the performance and effectiveness of different designs is difficult because researchers do not have a standardized set of criteria and procedures to follow. This leads to a wide range of tests being conducted, with variations in important factors such as walking speed and assistance provided, which greatly affect users' kinematics and kinetics. In this work, we investigate the possibilities and potential benefits of two of the most important design principles for supporting ankle propulsion with unpowered AFOs. To this end, we present and evaluate two AFO prototypes with springs parallel to the Achilles tendon based on: (i) a linear compression spring, and (ii) a customized leaf spring-cam transmission with a non-linear ankle torque-angle curve. The effects of both AFOs are reported for a case study with one healthy participant using both prototypes at two walking speeds under the same experimental conditions. Large reductions in muscular activity were found when the user received assistance, and ankle kinematics were influenced by the different assistance approaches. This case study was intended as a first step to provide insights on how two promising principles can passively support push-off during gait.

Original languageEnglish
Title of host publication2023 International Conference on Rehabilitation Robotics (ICORR)
PublisherIEEE
Pages1-6
Number of pages6
Volume2023
ISBN (Electronic)979-8-3503-4275-8
ISBN (Print)979-8-3503-4276-5
DOIs
Publication statusPublished - 8 Nov 2023
Event18th IEEE International Conference on Rehabilitation Robotics, ICORR 2023 - Singapore, Singapore
Duration: 24 Sept 202328 Sept 2023
Conference number: 18

Publication series

NameIEEE ... International Conference on Rehabilitation Robotics : [proceedings]
PublisherIEEE
ISSN (Print)1945-7901

Conference

Conference18th IEEE International Conference on Rehabilitation Robotics, ICORR 2023
Abbreviated titleICORR 2023
Country/TerritorySingapore
CitySingapore
Period24/09/2328/09/23

Keywords

  • 2023 OA procedure

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