Wassel classification for radial polydactyly

Last revised by Jeremy Jones on 22 Sep 2023

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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