Your shoulder complex, composed of the clavicle, scapula, and humerus, is an intricately designed combination of four joints, the Glenohumeral (GH) Joint, the Acromioclavicular (AC) Joint and the Sternoclavicular (SC) Joint and a ‘floating joint’, the Scapulothoracic (ST) Joint. The GH, AC and SC joints link the arm to the skeleton and the ST joint allows for your shoulder blade to glide over the contours of your upper back. All four joints work collectively to achieve normal