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A rare case of thumb polydactyly with metacarpophalangeal joint synostosis
Published in Case Reports in Plastic Surgery and Hand Surgery, 2019
Michael Finsterwald, Sebastian Guenkel
Even though thumb polydactyly is the most common form of polydactyly in the hand, these cases cannot be classified in the widely used classification by Wassel [4]. Of the multiple modifications of Wassels description, the Rotterdam classification by Zuidam et al [5] is the most complete including bony separation into the carpal bones, thumb triplication as well as synostosis and symphalangism. In a study by Dijkman et al [15], of 520 thumb polydactyly patients only 60% could be classified by the Wassel classification in comparison to 100% by the Rotterdam classification. According to it, our presented case would be classified as Type IV S (symphalangism) u (ulnar).