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Scapulothoracic (ST) rotation is comprised of internal/external rotation (solid green arrow), upward/downward rotation (solid red arrow), and posterior/anterior tilting (solid blue arrow). Glenohumeral (GH) motions of interest (not shown for clarity) include plane of elevation (anterior or posterior to the scapular plane) (blue outlined arrow), elevation (red outlined arrow), and axial rotation (internal/external) about the humeral long axis (green outlined arrow).
