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Radiological Evidence of Costoclavicular Joint

Sometimes the ligamentous connection between clavicle and first rib can be converted into a diarthrodial union and a new joint: costoclavicular joint comes into existence. Very scanty literature is available documenting the presence of faceted apophysis on the under surface of clavicle at the attachment area of costoclavicular ligament, suggesting an articular area for costoclavicular joint. It is said that when such type of joint is present, the costoclavicular ligament acts as a joint capsule.120 CT scout films (cervical and thoracic region) and 245 digital chest X-ray films (postero-anterior view) were observed. Out of 365 radiological images (males =202, females=163), 10 cases (2.7%) showed approximation of clavicle and ossified first costal cartilage at site of attachment of costoclavicular ligament, suggesting presence of costoclavicular joint.