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Tardy ulnar nerve palsy in children.

Tardy ulnar nerve palsy in the child is an infrequent occurrence. In 5 cases all occurring after injury about the elbow, the lesion involved not only lateral but also medial structures. The latency period from elbow injury to palsy was not always long and ranged from 2 months to 29 months. Possibly because of the age of the patients and short duration of the palsy, anterior transposition promoted prompt remission of symptoms and signs.