The sternoclavicular joint is surrounded by a joint capsule and is reinforced by four ligaments:
The anterior and posterior sternoclavicular ligaments are anterior and posterior, respectively, to the joint.
An interclavicular ligament links the ends of the two clavicles to each other and to the superior surface of the manubrium of the sternum.
The costoclavicular ligament is positioned laterally to the joint and links the proximal end of the clavicle to the first rib and related costal cartilage.