Wassel classification for radial polydactyly

Last revised by Dr Jeremy Jones on 06 Feb 2021

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

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Cases and figures

  • Case 1: Wassel 1
    Drag here to reorder.
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