Non-union of pediatric fibula fractures: easy to overlook, painful to ignore.

Fracture non-union in the pediatric population may span the age range from childhood to adolescence. Fracture non-union in children and adolescents is often due to an underlying cause such as affliction with neurofibromatosis or osteogenesis imperfecta. Although less commonly seen, non-union may occur in the otherwise healthy pediatric population. We report three cases of fracture non-union of the distal end of the fibula in the pediatric age group. All three were characterized by persistent local pain and tenderness following injury with radiographic evidence of fracture non-union. All three had undergone conservative treatment with extended periods of immobilization. Following surgery, all three had marked improvement of their local symptomatology. One patient's course was complicated by reflex sympathetic dystrophy syndrome. In two patients, resection of the un-united fragment at the distal fibula resulted in marked relief from pain without any increase in ankle instability. We postulate that the fracture non-union resulted in a fibrotic reaction that was so extensive that ankle stability was maintained even after removal of the fracture fragment.