Abstract
Metzger AJ, Dromerick AW, Holley RJ, Lum PS. Characterization of compensatory trunk
movements during prosthetic upper limb reaching tasks.
Objective
To characterize the compensatory movements of the trunk during functional reaching
tasks performed by upper limb prosthesis users.
Design
Survey.
Setting
Clinical laboratory at a national rehabilitation hospital.
Participants
Transhumeral and transradial prosthesis users (n=10) and uninjured control subjects
(n=10).
Interventions
Not applicable.
Main Outcome Measures
Three-dimensional motion analysis data were collected during simulated reaching tasks,
such as donning a cap, placing a nut, and sorting clothes. The metrics were range
of motion of the trunk in the 3 anatomical directions and elbow and shoulder path
distance.
Results
Prosthesis users had significantly larger truncal movements than controls during all
3 reaching tasks in all 3 directions (P≤.03). Shoulder path distance in persons with amputation was larger than in controls
in all 3 tasks (P<.01). Elbow path distance in persons with amputation was larger than in controls
in the nut and clothes tasks (P≤.02). The subgroup of transradial prosthesis users displayed these abnormal movements
despite the presence of an intact elbow.
Conclusions
The altered physiologic structure of the arm caused the individuals to develop a different
motor control strategy than an intact arm. Functional limitations, such as the loss
of distal degrees of freedom, required persons with amputation to use trunk displacement
in place of arm/hand movement. These compensatory movements during reaching tasks
may be a cause of prosthesis rejection and, in some cases, may be resolved with proper
rehabilitative training. Analysis of compensatory trunk movements may also provide
a useful endpoint for evaluating new prosthesis designs.
Key Words
List of Abbreviations:
ADLs (activities of daily living), AP (anterior-posterior), DOF (degree of freedom), ML (medial-lateral), ROM (range of motion), V (vertical)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: March 26, 2012
Footnotes
Supported by the U.S. Army Medical Research and Materiel Command (grant no. W81XWH-05-1-0160).
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.
In-press corrected proof published online on May 16, 2012, at www.archives-pmr.org.
Identification
Copyright
© 2012 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
