Wassel classification for radial polydactyly
The Wassel classification system is used to classify pre-axial polydactyly, also called radial polydactyly.
The classification system is based on the 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