Scapulothoracic Joint
Description[edit | edit source]
acromion process to the lateral end of the clavicle through the AC joint; the clavicle, in turn, is attached to the axial skeleton at the manubrium of the sternum through the SC joint. Any movement of the scapula on the thorax mustresult in movement at either the AC
joint, the SC joint, or both; that is, the functional ST joint is part of a true closed chain with the AC and SC joints and the thorax. Observation and measure-ment of individual SC and AC joint motions are more difficult than observing or measuring motions of the scapula on the thorax. Consequently, ST position and motions are described and measured far more fre-quently than are the SC and AC joint motions upon which ST motions are dependent.