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
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