Validation of wearable visual feedback for retraining foot progression angle using inertial sensors and an augmented reality headset

Angelos Karatsidis (Corresponding Author), Rosie E. Richards, Jason M. Konrath, Josien C. van den Noort, H. Martin Schepers, Giovanni Bellusci, Jaap Harlaar, Petrus H. Veltink

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)
38 Downloads (Pure)

Abstract

Background
Gait retraining interventions using real-time biofeedback have been proposed to alter the loading across the knee joint in patients with knee osteoarthritis. Despite the demonstrated benefits of these conservative treatments, their clinical adoption is currently obstructed by the high complexity, spatial demands, and cost of optical motion capture systems. In this study we propose and evaluate a wearable visual feedback system for gait retraining of the foot progression angle (FPA).

Methods
The primary components of the system are inertial measurement units, which track the human movement without spatial limitations, and an augmented reality headset used to project the visual feedback in the visual field. The adapted gait protocol contained five different target angles ranging from 15 degrees toe-out to 5 degrees toe-in. Eleven healthy participants walked on an instrumented treadmill, and the protocol was performed using both an established laboratory visual feedback driven by optical motion capture, and the proposed wearable system.

Results and conclusions
The wearable system tracked FPA with an accuracy of 2.4 degrees RMS and ICC=0.94 across all target angles and subjects, when compared to an optical motion capture reference. In addition, the effectiveness of the biofeedback, reflected by the number of steps with FPA value ±2 degrees from the target, was found to be around 50% in both wearable and laboratory approaches. These findings demonstrate that retraining of the FPA using wearable inertial sensing and visual feedback is feasible with effectiveness matching closely an established laboratory method. The proposed wearable setup may reduce the complexity of gait retraining applications and facilitate their transfer to routine clinical practice.
Original languageEnglish
Article number78
Number of pages12
JournalJournal of neuroengineering and rehabilitation
Volume15
Issue number1
DOIs
Publication statusPublished - 15 Aug 2018

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Sensory Feedback
Foot
Gait
Toes
Knee Osteoarthritis
Knee Joint
Visual Fields
Healthy Volunteers
Costs and Cost Analysis
Biofeedback (Psychology)

Keywords

  • Foot progression angle
  • Inertial Sensors
  • Real-time biofeedback
  • Augmented reality headset
  • Gait retraining
  • Knee osteoarthritis

Cite this

Karatsidis, Angelos ; Richards, Rosie E. ; Konrath, Jason M. ; van den Noort, Josien C. ; Schepers, H. Martin ; Bellusci, Giovanni ; Harlaar, Jaap ; Veltink, Petrus H. / Validation of wearable visual feedback for retraining foot progression angle using inertial sensors and an augmented reality headset. In: Journal of neuroengineering and rehabilitation. 2018 ; Vol. 15, No. 1.
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abstract = "BackgroundGait retraining interventions using real-time biofeedback have been proposed to alter the loading across the knee joint in patients with knee osteoarthritis. Despite the demonstrated benefits of these conservative treatments, their clinical adoption is currently obstructed by the high complexity, spatial demands, and cost of optical motion capture systems. In this study we propose and evaluate a wearable visual feedback system for gait retraining of the foot progression angle (FPA).MethodsThe primary components of the system are inertial measurement units, which track the human movement without spatial limitations, and an augmented reality headset used to project the visual feedback in the visual field. The adapted gait protocol contained five different target angles ranging from 15 degrees toe-out to 5 degrees toe-in. Eleven healthy participants walked on an instrumented treadmill, and the protocol was performed using both an established laboratory visual feedback driven by optical motion capture, and the proposed wearable system.Results and conclusionsThe wearable system tracked FPA with an accuracy of 2.4 degrees RMS and ICC=0.94 across all target angles and subjects, when compared to an optical motion capture reference. In addition, the effectiveness of the biofeedback, reflected by the number of steps with FPA value ±2 degrees from the target, was found to be around 50{\%} in both wearable and laboratory approaches. These findings demonstrate that retraining of the FPA using wearable inertial sensing and visual feedback is feasible with effectiveness matching closely an established laboratory method. The proposed wearable setup may reduce the complexity of gait retraining applications and facilitate their transfer to routine clinical practice.",
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Validation of wearable visual feedback for retraining foot progression angle using inertial sensors and an augmented reality headset. / Karatsidis, Angelos (Corresponding Author); Richards, Rosie E.; Konrath, Jason M. ; van den Noort, Josien C.; Schepers, H. Martin; Bellusci, Giovanni; Harlaar, Jaap; Veltink, Petrus H.

In: Journal of neuroengineering and rehabilitation, Vol. 15, No. 1, 78, 15.08.2018.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Validation of wearable visual feedback for retraining foot progression angle using inertial sensors and an augmented reality headset

AU - Karatsidis, Angelos

AU - Richards, Rosie E.

AU - Konrath, Jason M.

AU - van den Noort, Josien C.

AU - Schepers, H. Martin

AU - Bellusci, Giovanni

AU - Harlaar, Jaap

AU - Veltink, Petrus H.

PY - 2018/8/15

Y1 - 2018/8/15

N2 - BackgroundGait retraining interventions using real-time biofeedback have been proposed to alter the loading across the knee joint in patients with knee osteoarthritis. Despite the demonstrated benefits of these conservative treatments, their clinical adoption is currently obstructed by the high complexity, spatial demands, and cost of optical motion capture systems. In this study we propose and evaluate a wearable visual feedback system for gait retraining of the foot progression angle (FPA).MethodsThe primary components of the system are inertial measurement units, which track the human movement without spatial limitations, and an augmented reality headset used to project the visual feedback in the visual field. The adapted gait protocol contained five different target angles ranging from 15 degrees toe-out to 5 degrees toe-in. Eleven healthy participants walked on an instrumented treadmill, and the protocol was performed using both an established laboratory visual feedback driven by optical motion capture, and the proposed wearable system.Results and conclusionsThe wearable system tracked FPA with an accuracy of 2.4 degrees RMS and ICC=0.94 across all target angles and subjects, when compared to an optical motion capture reference. In addition, the effectiveness of the biofeedback, reflected by the number of steps with FPA value ±2 degrees from the target, was found to be around 50% in both wearable and laboratory approaches. These findings demonstrate that retraining of the FPA using wearable inertial sensing and visual feedback is feasible with effectiveness matching closely an established laboratory method. The proposed wearable setup may reduce the complexity of gait retraining applications and facilitate their transfer to routine clinical practice.

AB - BackgroundGait retraining interventions using real-time biofeedback have been proposed to alter the loading across the knee joint in patients with knee osteoarthritis. Despite the demonstrated benefits of these conservative treatments, their clinical adoption is currently obstructed by the high complexity, spatial demands, and cost of optical motion capture systems. In this study we propose and evaluate a wearable visual feedback system for gait retraining of the foot progression angle (FPA).MethodsThe primary components of the system are inertial measurement units, which track the human movement without spatial limitations, and an augmented reality headset used to project the visual feedback in the visual field. The adapted gait protocol contained five different target angles ranging from 15 degrees toe-out to 5 degrees toe-in. Eleven healthy participants walked on an instrumented treadmill, and the protocol was performed using both an established laboratory visual feedback driven by optical motion capture, and the proposed wearable system.Results and conclusionsThe wearable system tracked FPA with an accuracy of 2.4 degrees RMS and ICC=0.94 across all target angles and subjects, when compared to an optical motion capture reference. In addition, the effectiveness of the biofeedback, reflected by the number of steps with FPA value ±2 degrees from the target, was found to be around 50% in both wearable and laboratory approaches. These findings demonstrate that retraining of the FPA using wearable inertial sensing and visual feedback is feasible with effectiveness matching closely an established laboratory method. The proposed wearable setup may reduce the complexity of gait retraining applications and facilitate their transfer to routine clinical practice.

KW - Foot progression angle

KW - Inertial Sensors

KW - Real-time biofeedback

KW - Augmented reality headset

KW - Gait retraining

KW - Knee osteoarthritis

U2 - 10.1186/s12984-018-0419-2

DO - 10.1186/s12984-018-0419-2

M3 - Article

VL - 15

JO - Journal of neuroengineering and rehabilitation

JF - Journal of neuroengineering and rehabilitation

SN - 1743-0003

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