The articular surfaces of the sternoclavicular joint are covered by fibrocartilage, an anomaly for a synovial joint. The surface upon the manubrium sternii sits at 45 degrees to the vertical. The surface on the medial end of the clavicle extends a short distance onto its inferior surface. This permits articulation with the first costal cartilage that partially sits within the inferior end of the joint.
The articular surfaces are far from congruous:
The interposition of the fibrocartilaginous disc increases congruity.
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