Congenital duplication of the foot and toes.

Congenital duplication of the foot and toes is a commonly diagnosed condition in newborn nurseries across the United States. The foot involvement varies from simple fleshy tags to complex attempts at whole extremity duplication. We reviewed 59 patients (82 feet) with a variety of duplications (excluding skin tags). During our review, we devised a new descriptive system of classification of congenital duplications of the foot based primarily on the type and complexity of the skeletal duplication. Variables related to sex, bilaterality, age at surgery, family history, and follow-up results were documented, and an exact classification of each foot was accomplished. Results and prognosis vary with the class of duplication being treated and must be individualized case by case.