Fracture through the apex of a delta tibia (minor tibial duplication) following minor injury.

Delta tibia (also known as minor tibial duplication) is a rare variant of congenital anterolateral tibial bowing. It is not associated with neurofibromatosis or pseudarthrosis in which there are characteristic changes on the lateral radiograph. This deformity is not thought to be prone to fracture. We describe a child with this deformity, who during a 4-year period sustained two separate fractures following relatively minor trauma. In both circumstances, the injury healed well with no evidence of pseudarthrosis formation.