Presentation
Fall off a quad bike. Now severe pain in region of AC joint
Patient Data
Bone fragment arising from the base of the coracoid process (arrow). Gleno-humeral joint is normal
Avusion of bone from the base of the coracoid on its cephalad surface at the origin of the coraco-clavicular ligament. Associated soft tissue swelling indicating acute injury. This is at the site of an ossification center of the coracoid akin to the more common avusion injury in the pelvis at the rectus femoris tendon origin. Note slight upward displacement of the clavicle in relation to the acromion indicating that this is primarily an AC joint injury with disruption to the ligament attachment due to traumatic upward displacement of the clavicle. In children ligaments are often stronger than bone attachments thus fracture avulsions as seen here are relativey common.