Avian Spur

Facts:

• AKA supracondylar process of the humerus
• Congenital osseous/cartilagenous projection arising from the anteromedial surface of the distal humerus
• Found in 1% of population
• Associated with ligament of Struthers, which connects the process to the medial epicondyle (fibers of pronator teres may arise from this structure)
• Median nerve and brachial artery pass below this arch and may be compressed
• Fracture is possible but rare

Reference:

Egol KA, Koval KJ, Zuckerman JD. Handbook of fractures; 4th ed, 2010.