PEDIATRIC ULNAR MONONEUROPATHY - REPORT OF 21 ELECTROMYOGRAPHY-DOCUMENTED CASES AND REVIEW OF THE LITERATURE

Pediatric ulnar mononeuropathies are the most frequent upper extremity mononeuropathies seen in the electromyography laboratory at The Child ren's Hospital, Boston, Twenty-one children (12 boys and nine girls) w ith pediatric ulnar mononeuropathy, aged 5 to 18 years, were seen from 1979 to 1991. The causes included acute trauma in 11 children (52%, c ompression in five children (24%), entrapment in three children (14%), and indeterminate in two children (10%). The sites of nerve injury in cluded the elbow in 10 children (48%), forearm in three children (14%) , wrist in five children (24%), hand in one child (4%), and indetermin ate in the remaining two children (10%). Prognosis is more favorable i n nontraumatic (83% improved) pediatric ulnar neuropathies than with t raumatic lesions (56% improved), with at least a 1-year follow-up.