The influence of a powered knee-ankle-foot orthosis on walking in poliomyelitis subjects: A pilot study

Arazpour, M, Moradi, A, Samadian, M, Bahramizadeh, M, Joghtaei, M, Ahmadi Bani, M, Hutchins, SW and Mardani, MA 2016, 'The influence of a powered knee-ankle-foot orthosis on walking in poliomyelitis subjects: A pilot study' , Prosthetics and Orthotics International, 40 (3) , pp. 377-383.

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Background: Traditionally, the anatomical knee joint is locked in extension when walking with a conventional knee-ankle-foot orthosis. A powered knee-ankle-foot orthosis was developed to provide restriction of knee flexion during stance phase and active flexion and extension of the knee during swing phase of gait. Objective: The purpose of this study was to determine differences of the powered knee-ankle-foot orthosis compared to a locked knee-ankle-foot orthosis in kinematic data and temporospatial parameters during ambulation. Study design: Quasi-experimental design. Methods: Subjects with poliomyelitis (n = 7) volunteered for this study and undertook gait analysis with both the powered and the conventional knee-ankle-foot orthoses. Three trials per orthosis were collected while each subject walked along a 6-m walkway using a calibrated six-camera three-dimensional video-based motion analysis system. Results: Walking with the powered knee-ankle-foot orthosis resulted in a significant reduction in both walking speed and step length (both 18%), but a significant increase in stance phase percentage compared to walking with the conventional knee-ankle-foot orthosis. Cadence was not significantly different between the two test conditions (p = 0.751). There was significantly higher knee flexion during swing phase and increased hip hiking when using the powered orthosis. Conclusion: The new powered orthosis permitted improved knee joint kinematic for knee-ankle-foot orthosis users while providing knee support in stance and active knee motion in swing in the gait cycle. Therefore, the new powered orthosis provided more natural knee flexion during swing for orthosis users compared to the locked knee-ankle-foot orthosis.

Item Type: Article
Schools: Schools > School of Health Sciences
Journal or Publication Title: Prosthetics and Orthotics International
Publisher: Sage
ISSN: 0309-3646
Depositing User: USIR Admin
Date Deposited: 23 Dec 2016 12:49
Last Modified: 27 Aug 2021 20:35

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