costal tuberosity of clavicle costal tuberosity of clavicle on the medial part of the clavicle is a broad rough surface, the costal tuberosity (impression for costoclavicular ligament), rather more than 2 cm. in length, for the attachment of the costoclavicular ligament. costal tuberosity of clavicleleft clavicle. inferior surface. (costal tuberosity labeled at center left.)detailsidentifierslatinimpressio ligamenti costoclavicularis, tuberositas costalis claviculaeta98a02.4.02.004ta21171fma75810anatomical terms of bone