[1] The joint is formed by the sternal end of the clavicle, the clavicular notch of the sternum, and (the superior surface of) the costal cartilage of the first rib.

[1] The joint capsule is thickened anteriorly and posteriorly, but is thinner superiorly and (especially) inferiorly, where it consists mostly of loose areolar connective tissue.

Muscles do not directly act on this joint, although almost all actions of the shoulder girdle or the scapula will cause some motion at this articulation.

[3] Sternoclavicular dislocation is rare,[2] but may result from direct trauma to the clavicle or indirect forces applied to the shoulder.

[citation needed] This article incorporates text in the public domain from page 313 of the 20th edition of Gray's Anatomy (1918)