1. Scapula motion is the result of the SC and AC joints working together to produce scapulothoracic movement. The SC joint moves the scapula in position and the AC joint provides an adjustment to achieve the final desired position. First and second motions identified for a joint correlate with the corresponding first and second motions of the other joints, respectively. Corresponding first motions are bolded for each joint. A) AP axis motion of elevation or depression at SC joint and upward rotation or downward rotation adjustment at AC joint produce upward rotation or downward rotation of the scapula on the thorax. B) AP axis motion of elevation or depression at the SC joint and downward or upward rotation adjustment at the AC joint produce elevation or depression of the scapula on the thorax. C) Vertical axis motion of protraction or retraction at SC joint and anterior rotation or posterior rotation adjustment in the horizontal plane at the AC joint produce protraction or retraction of the scapula on the thorax.
Source: Shoulder Complex, Brunnstrom's Clinical Kinesiology, 6e
Citation: Houglum PA, Bertoti DB. Brunnstrom's Clinical Kinesiology, 6e; 2012 Available at: Accessed: December 19, 2017
Copyright © 2017 McGraw-Hill Education. All rights reserved