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Thumb/first web classification

Authoring team

Cole and Manske described a classification system for ulnar dysplasia that is based on the morphology of the thumb and first web space:

  • type A: normal
  • B:
    • narrow first web
    • mild thumb deficiency
    • extrinsic tendons intact
    • opposition present
  • C:
    • syndactyly of thumb to index
    • hypoplastic thumb malrotated into plane of palm
    • lack of opposition
    • lack of extrinsic extensor function
  • D: absent thumb

 

Ref: Cole RJ, Manske PR (1997); J Hand Surg (Am); 22(3): 479-488.

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