Wassel Classification of Thumb Polydactyly

Courtesy: Rishi Dhir, FRCS Orth, UK

Wassel Classification of Thumb Polydactyly

• type I describes a bifid distal phalanx
• type II, duplicated distal phalanx
• type III, bifid proximal phalanx
• type IV, duplicated proximal phalanx
• type V, bifid metacarpal
• type VI, duplicated metacarpal
• type VII, triphalangism