Subject: ScienceDirect - Clinical Biomechanics : The effect of gait modification on the external knee adduction moment is reference frame dependent



   

 

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Clinical Biomechanics

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 doi:10.1016/j.clinbiomech.2007.12.008      

Copyright © 2007 Elsevier Ltd All rights reserved.

Brief report

The effect of gait modification on the external knee adduction moment is reference frame dependent

Anthony G. Schache, Benjamin J. Fregly, Kay M. Crossley, Rana S. Hinman and Marcus G. Pandy

Department of Mechanical Engineering, University of Melbourne, Victoria 3010, Australia

Centre for Health, Exercise and Sports Medicine, School of Physiotherapy, University of Melbourne, Victoria 3010, Australia

Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA

Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA

Department of Orthopaedics and Rehabilitation, University of Florida, Gainesville, FL, USA


Received 7 August 2007;  accepted 17 December 2007.  Available online 15 February 2008. 

 

Abstract

Background

This study investigated the extent to which reference frame convention affects the interpretation of how gait modification alters the external knee adduction moment.

Methods

Data were collected from a single male able-bodied subject performing three gait tasks: normal, toe out and medial thrust. The net external moment vector at the knee was expressed in five alternative reference frames: the femur anatomical frame, the proximal tibia anatomical frame, the distal tibia anatomical frame, the laboratory frame and a non-orthogonal knee joint coordinate system. For each reference frame, the knee adduction moment was taken as the component about the frame’s anteroposterior axis.

Findings

Gait modification and selected reference frame both influenced the calculated knee adduction moment. Furthermore, these two effects were interactive, with the magnitude of the changes in the knee adduction moment produced by toe out and medial thrust gait being highly dependent on selected reference frame.

Interpretation

Choice of reference frame for calculating the external knee adduction moment is therefore an important consideration for studies investigating the relative effectiveness of interventions such as gait modification.

Keywords: Gait; Knee; Joint moment; Reference frame

Article Outline

1. Introduction

2. Methods

2.1. Data collection

2.2. Data processing

3. Results

4. Discussion

References




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Clinical Biomechanics

Article in Press, Corrected Proof - Note to users

 

 

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