Costoclavikulare

Costoclavikulare, or ligamentum costoclaviculare in Latin, is a strong extrinsic ligament of the sternoclavicular joint. It connects the clavicle to the first rib and helps stabilize the anterior end of the clavicle where it meets the chest wall.

Anatomy: The ligament runs from the inferior surface of the medial end of the clavicle to the superior surface of the first rib at the costal tubercle, near the junction with the first costal cartilage. It lies beneath the sternoclavicular joint capsule and is oriented obliquely downward and medially. It is commonly described as the strongest ligament of the sternoclavicular joint and contributes to the joint’s overall stability by anchoring the clavicle to the first rib.

Function: The costoclavicular ligament limits elevation of the medial end of the clavicle, particularly during shoulder girdle elevation and arm movement. By restricting excessive motion at the sternoclavicular joint, it helps stabilize the shoulder complex during powerful or rapid movements and under load.

Clinical significance: Injury to the sternoclavicular joint can involve the costoclavicular ligament, and understanding its role is important in assessing joint stability after trauma. Variations in attachment or degree of laxity are uncommon but may affect joint mechanics. In surgical procedures addressing sternoclavicular instability, the ligament may be preserved or released as needed for stabilization.

See also: sternoclavicular joint, ligaments of the shoulder girdle.