The upper limb attaches to the trunk via the shoulder (pectoral) girdle. The shoulder complex in total consists of the scapula and clavicle, articulating with the ribcage and sternum to form four joints, all of which require attention in the management of shoulder pain. The clavicle forms a strut for the shoulder, holding the arm away from the side of the body and allowing a greater range of unencumbered movement. At one end, the clavicle joins the sternum through the sternoclavicular joint, while at the other it joins the scapula via the acromioclavicular joint.