The Wassel classification system is used to classify pre-axial polydactyly, also called radial polydactyly.
The classification system is based on the type (bifid vs duplication) and level of duplication from distal to proximal.
I: bifid distal phalanx
II: duplicated distal phalanx
III: bifid proximal phalanx
IV: duplicated proximal phalanx
V: bifid metacarpal
VI: duplicated metacarpal
VII: triphalangism
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