The Z-Axis Shoulder Joint - A New Concept

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1997

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Abstract

It is difficult for a shoulder amputee to do anything while sitting at a desk or table with the elbow tucked in against the side. For useful work the elbow needs to move forward 30-45 degrees and out 30-45 degrees to a position of function. These moves require a well designed shoulder joint. Conventional friction joints are constrained to move about an abduction axis followed by a forward flexion axis with both motions against gravity. An ideal shoulder moves 'out' away from vertical and then locks. It then swings forward or back around the vertical Z axis with no gravitational constraint. Such a joint places the forearm in a convenient location for useful work.

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From "MEC 97," Proceedings of the 1997 MyoElectric Controls/Powered Prosthetics Symposium Fredericton, New Brunswick, Canada: August, 1997. Copyright University of New Brunswick.

Copyright 2002, 2005 and 2008, The University of New Brunswick.

This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License. Creative Commons License