Design and analysis of a new medial reciprocal linkage using a lower limb paralysis simulator

Ahmadi Bani, M, Arazpour, M, Farahmand, F, Sefati, S, Baniasad, M, Hutchins, SW, Vahab Kashani, R and Mousavi, ME 2015, 'Design and analysis of a new medial reciprocal linkage using a lower limb paralysis simulator' , Spinal Cord, 53 (5) , pp. 380-386.

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Abstract

STUDY DESIGN: A feasibility study on the effect of a new reciprocating orthosis on specific gait parameters for use by people with spinal cord injury. OBJECTIVES: The aim of this study was to design and develop a new medial linkage orthosis (MLO) mechanism incorporating a reciprocating motion and to determine its efficacy in improving specific spatiotemporal, kinematic and kinetic parameters while ambulating when worn by healthy subjects. This was achieved via the use of a lower limb paralysis simulator (LLPS). METHODS: A reciprocating joint with a remote center of motion was designed for use as an MLO. A prototype was fabricated and incorporated into an orthosis and equipped with a saddle to make the reciprocating motion possible. The efficacy of the orthosis was evaluated on four able-bodied healthy subjects who were trained to walk with the MLO attached to the LLPS. RESULTS: Mean walking speed, stride length, stride time and cadence was 0.09±0.007 m s(-1), 0.42±0.01 m, 4.89±0.45 s and 29.54±4.32 steps min(-1), respectively, when healthy subjects walked with the new orthosis. The mean hip joint torque produced was 0.36±0.13 Nm. CONCLUSION: In this study a new MLO was designed and fabricated that provided a reciprocating mechanism using a four-bar mechanism to set the virtual axis of the mechanism in a more proximal position than hinge-type joints. Further investigation is currently underway to assess its effect on gait parameters and energy expenditure in paraplegic patients.

Item Type: Article
Schools: Schools > School of Health Sciences
Journal or Publication Title: Spinal Cord
Publisher: Nature Publishing Group
ISSN: 1362-4393
Depositing User: WM Taylor
Date Deposited: 04 Nov 2016 13:26
Last Modified: 04 Nov 2016 13:26
URI: http://usir.salford.ac.uk/id/eprint/40593

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