Thumb duplication - simple surgery for a common problem?

Polydactyly is one of the most common congenital anomalies of the hand, and thumb duplication the most common manifestation of polydactyly. Despite this, the results of surgical treatment for thumb duplication are frequently disappointing, and deformities secondary to improperly executed reduction procedures often make further corrective surgery necessary. Examples of thumb duplication, their characteristic abnormal anatomy, and the complexity of surgical reduction procedures are illustrated.