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Coracoclavicular ligament
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The coracoclavicular ligament is a strong extrinsic ligament of the acromioclavicular (AC) joint. It is comprised of two parts that have attachments at the acromial end of the clavicle: a posteromedial conoid part that attaches to the conoid tubercle and an anterolateral trapezoid part that attaches to the trapezoid line. Both parts merge and fuse together at their attachment on the coracoid process of the scapula. The two parts of the coracoclavicular ligament are often separated by a bursa.
The coracoclavicular ligament passively suspends the scapula and free upper limb from the clavicle. It is also a strong stabilizer of the AC joint, preventing the acromion from being driven inferiorly from the clavicle (superior dislocation of the AC joint) as well as excessive rotation of the clavicle and scapula, whilst still allowing retraction and protraction of the acromion.
| Terminology |
English: Coracoclavicular ligament Latin: Ligamentum coracoclaviculare |
| Attachments | Conoid part: conoid tubercle -> coracoid process Trapezoid part: trapezoid line -> coracoid process |
| Function | Vertical stabilizer of acromioclavicular joint; prevents superior dislocation of acromioclavicular joint. Also prevents excessive rotation of the scapula and clavicle |
Learn more about the ligaments of the upper limb with this study unit (and article):
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