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Spinal Cord. 2015 May;53(5):380-6. doi: 10.1038/sc.2014.193. Epub 2014 Nov 11.

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

Author information

1
Department of Orthotics and Prosthetics, University of Social Welfare and Rehabilitation Science, Tehran, Iran.
2
1] Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran [2] Research Center of Biomedical Technology and Robotics, Tehran University of Medical Sciences, Tehran, Iran.
3
Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran.
4
University of Salford, IHSCR, Faculty of Health and Social Care, University of Salford, Salford, UK.

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.

PMID:
25384401
DOI:
10.1038/sc.2014.193
[Indexed for MEDLINE]

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