Table 1 Classification of thumb polydactyly used in the current study
From: Epidemiological statistics of congenital thumb duplication in the Chinese population
Wassel I | Bifid distal phalanx |
|---|---|
Wassel II | Duplicated distal phalanx |
Wassel III | Bifid proximal phalanx |
Wassel IV | Duplicated proximal phalanx |
Wassel V | Bifid metacarpal |
Wassel VI | Duplicated metacarpal |
Wassel VII | Thumb duplication with triphalangism |
Rudimentary | Small appendage with a narrow pedicle |