Fracture of the distal part of the radius associated with severed ulnar nerve.

We report a case of a severed ulnar nerve after fracture of the distal part of the radius. The most likely hypothesis is stretching of the ulnar nerve fixed by Guyon's canal and severed on the sharp edge of the proximal radius. Although very rare, this lesion must be investigated particularly in cases with marked displacement, especially ulnar and/or volar.