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Case 87

Supracondylar process

An unusual humerus

Andrew Downie

Diagnosis

Supracondylar process

Discussion

The supracondylar process is a normal variant present in between 0.5 and 1% of subjects. It is the origin of a fibrous band that extends to the medial epicondyle at the elbow joint, and thus points towards the joint. This helps distinguish it from an exostosis (osteochondroma) which tends to point away from the joint. The median nerve and artery pass beneath the band, and in a small minority it may cause compressive symptoms.

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