Table 2.
Wassel classification of thumb polydactyly.
| Wassel Classification of Thumb Polydactyly | |
|---|---|
| Type I | 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 | Triphalangeal thumb |