Lumbar nerve root avulsions with secondary ipsilateral hip dysplasia in a child.

We report on an 8-year-old child with avulsions of the left L3, L4 and L5 nerve roots and traumatic meningoceles that were not associated with lumbar spine or pelvic girdle fractures. The patient had a history of a road traffic accident. Plain radiographs of the pelvis revealed left hip dysplasia. The magnetic resonance imaging findings of the lumbar spine are illustrated. The pathogenesis of lumbar nerve root avulsions and their association with ipsilateral hip dysplasia are discussed.