A Transparent Lower Limb Perturbator to Investigate Joint Impedance During Gait

Van 'T Veld, Ronald C.; Fricke, S. S.; Prieto, Ander Vallinas; Keemink, Arvid Q L; Schouten, A.C.; Kooij, H.; Van Asseldonk, Edwin H.F.

doi:10.1007/978-3-030-70316-5_84

A Transparent Lower Limb Perturbator to Investigate Joint Impedance During Gait

Book chapter (2022)

Authors

Ronald C. Van 'T Veld University of Twente

S. S. Fricke University of Twente

Ander Vallinas Prieto University of Twente

Arvid Q L Keemink University of Twente

A.C. Schouten University of Twente, Biomechatronics & Human-Machine Control - Mechanical, Maritime and Materials Engineering

H. Kooij Biomechatronics & Human-Machine Control - Mechanical, Maritime and Materials Engineering , University of Twente

Edwin H.F. Van Asseldonk University of Twente

Research Group

Biomechatronics & Human-Machine Control (Mechanical, Maritime and Materials Engineering) (TU Delft)

DOI: https://doi.org/10.1007/978-3-030-70316-5_84

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Published Date

2022

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Biomechanical Engineering

Research Group

Biomechatronics & Human-Machine Control

Abstract

Joint impedance plays an important role in postural control and movement. However, current experimental knowledge on lower limb impedance during gait is limited to the ankle joint. We designed the LOwer limb PERturbator (LOPER) aimed to assess knee and hip joint impedance during gait. The LOPER applies force perturbations with a 39 Hz bandwidth, tested on a free-hanging leg. In minimal impedance mode, peak interaction forces during walking are low (< 5 N). Also, this mode has a negligible effect on the gait pattern, as it is smaller than the within-subject variability during normal walking. In short, the LOPER is a transparent device able to elicit a clear response at both hip and knee joints to investigate lower limb dynamics. A second motor added to the LOPER could improve isolation of the perturbation contribution to knee and hip dynamics. People with neurological disorders can benefit from knowledge of joint impedance during gait through improved biomimetic devices and clinical decision making.

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