# Wassel classification

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The **Wassel classification** is used to categorise radial [polydactyly](/source/Polydactyly), based upon the most [proximal](/source/Proximal) level of skeletal duplication.[1]

## Classification

Type Level of duplication I Distal phalanx II Interphalangeal joint III Proximal phalanx IV Metacarpophalangeal joint V Metacarpal VI Carpometacarpal joint VII Triphalangia

## References

1. ["Orthobullets"](https://www.orthobullets.com/hand/6079/polydactyly-of-hand). Retrieved 27 October 2014.

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