1. The supracondyloid process of the humerus is a congenital anomaly found in slightly less than one per cent. of adult humans.
2. It arises from the medial and anterior surface of the humerus seventy-one to seventy-three millimeters above the lowest point of the inner border of the trochlea.
3. The median nerve and brachial artery pass directly under the process and are in close apposition with it.
4. The process may be fractured and give rise to symptoms of a median nerve causalgia. A case of this type is reported.
5. The treatment of choice in cases of fracture of supracondyloid spur is absolute rest with early physiotherapy. Surgical removal should only be attempted when a prolonged causalgia results.