The scapulothoracic joint is not a true joint as there is no bony articulation between the scapula and the thorax. Instead, the scapula "floats" on the back of the thorax and is held in place by the surrounding muscles. Therefore, there are no distinct planes or axes of movement. However, the scapula does move in relation to the thorax in a pattern known as scapulohumeral rhythm when the arm is raised overhead.
