Polydactyly is a congenital duplication within a limb. It occurs when more than five digits are present in the hand or foot. It may affect the whole digit or part of the digit.
Polydactlyly is the most common form of congenital upper limb anomaly. It can occur sporadically or in association with a number of syndromes. The underlying pathogenesis is likely to be disorganised segmentation of the limb bud during development.
Polydactyly can be subclassified according to site:
Last reviewed 01/2018