Abstract
Background
This study focuses on the relationship between overuse in association with wheelchair
activities of daily living and risks for osteoarthrosis in the acromioclavicular and
sternoclavicular joints. The aim is to quantify the joint moments and joint reaction
forces in all three joints of the shoulder complex during wheelchair-related activities
of daily living.
Methods
A convenience sample of 17 subjects performed two tasks (wheelchair propulsion and
weight relief lifting). Three-dimensional kinematics and kinetics were measured and
position and force data were used as input for a musculoskeletal model of the arm
and shoulder. Output variables of the model were the moments and the joint reaction
forces on the sternoclavicular, acromioclavicular and glenohumeral joints.
Findings
Moments on the sternoclavicular joint were higher than on the acromioclavicular and
glenohumeral joint, but the joint reaction forces on the sternoclavicular and acromioclavicular
joints were only one third of those on the glenohumeral joint (peak forces around
96 N compared to 315 N for wheelchair propulsion and around 330 N compared to 1288 N for weight relief lifting).
Interpretation
Based on the results found in this study, net joint moments are likely a better measure
to describe the load on the acromioclavicular and sternoclavicular joints due to the
passive stabilization. Prospective studies on wheelchair overuse injuries should also
look at the acromioclavicular and sternoclavicular joints since the load of wheelchair
tasks might be a risk factor for osteoarthrosis in these joints.
Keywords
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Article info
Publication history
Published online: February 14, 2011
Accepted:
January 13,
2011
Received:
August 23,
2010
Identification
Copyright
© 2011 Elsevier Ltd. Published by Elsevier Inc. All rights reserved.
