Radial polydactyly is one of the most common congenital hand anomaly with a wide range of manifestations. Historically, many classification schemes have been devised based on osseous anatomy as revealed by the simple radiograph. Wassel's classification is the most widely used classification system and many modifications have been proposed to accommodate the wide range of clinically relevant subtypes with diverse aberrant components. In recent years, several classification theories have been developed to facilitate surgical decision-making and evaluation of surgical outcomes. The current classification systems based on X-ray films have the limitations in describing the concrete morphology because of invisible structures, and surgical exploration is necessary for confirmation of the exact classification of the radial polydactyly.
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