The Effect of Scapular Restriction on Manual Work Space

Abstract

The effect of scapular restriction on the manual work space of 20 subjects was studied. The three-dimensional method to determine work space is presented. The work spaces of the extremity when unrestricted and when restricted by a shoulder harness are compared. The restriction of scapular movement reduced the work space volume by 54%. Less difference was found in the volumes of the restricted and unrestricted work spaces at the extreme anterior and posterior areas of the work space. Volume differences were greatest in the intervals immediately in front of the body. The work space was decreased in the areas above shoulder level due to restriction of the scapula. The lower regions of the work space, over the knees, showed minimal differences due to restriction. There were also changes in the bimanual work space when one scapula was restricted.