[Polydactyly].

Polydactyly is one of the hand's most frequent congenital deformities. Classification of this deformity distinguishes radial or thumb duplication, central duplication that is almost constantly associated with syndactyly (called polysyndactyly) and ulnar duplication. The latter is important especially in caucasian people because it can be part of a syndrome. Surgical techniques are briefly mentioned for the different forms.