Which polydactyly type is least common?

Which polydactyly type is least common?

• A. Preaxial polydactyly
• B. Central polydactyly
• C. Postaxial polydactyly
• D. Mesaxial polydactyly

Answer: (B)

Central polydactyly is the least common form because extra digits most often appear at the peripheral digits, either the great toe side (preaxial) or the little toe side (postaxial). The central (middle) digits are less frequently involved in duplication, reflecting the way limb development patterns digits along the axis. So among the common categories, central polydactyly occurs far less often than preaxial or postaxial types.