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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 |
