A new description of scapulothoracic motion during arm movements in healthy subjects

A sound understanding of the kinematics of the shoulder complex is important for the clinical evaluation and treatment of many pathological conditions (Sahrmann, 2001). It has long been observed clinically that the scapula over the thorax is finely coordinated with the rotations which occur at the glenohumeral joint (“scapulo-humeral rhythm”) (Codman, 1934).