Ulnar nerve entrapment due to heterotopic bone formation after a severe burn.

Heterotopic bone formation occurs in approximately 2% of severe burns. It occurs most frequently about the elbow and is not related to the location of the burn. Although bony encasement of the ulnar nerve is frequently found, signs and symptoms of ulnar nerve compression due to heterotopic bone have not been previously reported. Early anterior transposition of the nerve is recommended to prevent progressive neurologic loss if compressive symptoms are found in the face of developing heterotopic bone.