The lateral costotransverse ligament is a short, strong band connecting the apex of the transverse process to the posterior surface of the rib tubercle, forming the posterior boundary of the costotransverse joint.
Binds the rib tubercle to the transverse process, resisting anterior and inferior rib displacement. Together with the superior costotransverse ligament, constrains costotransverse joint motion to a gliding movement.
Ligament avulsion from the costotransverse joint occurs in severe thoracic trauma, contributing to posterior rib instability. Division of the lateral costotransverse ligament is required in posterior rib resection for thoracic outlet decompression and retropleural approaches.
Division required during first rib resection for thoracic outlet syndrome, allowing the rib to be freed from the transverse process for complete excision.
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