The supracondylar process of the humerus (also known as an avian spur) is a variant bony projection on the anteromedial aspect of the upper arm bone (humerus), about 5–6 cm above the medial epicondyle.

A fibrous band, Struthers ligament, may connect this process to the medial epicondyle.

[3] Supracondylar processes are usually asymptomatic, but may be palpable as a mass on the upper arm.

They are most commonly found as an incidental finding on radiographs made for other reasons, but occasionally isolated fractures of the process itself may lead to its discovery.

The supracondylar process is a vestigial remnant of the supracondylar foramen or epitrochlear foramen found in other vertebrates including cats, climbing mammals and lower primates.