Post-axial polydactyly

Post-axial polydactyly refers to polydactyly where the additional digit is on the ulnar margin of the hand, or lateral to the 5th toe.

Epidemiology

Post-axial polydactyly is more common than pre-axial polydactyly, with an estimated incidence of 1 in 3000.

Pathology

Classification

Post-axial polydactyly has been defined by Temtamy and McKusick as:

  • type A: additional digit at the MCP joint (or more proximally at the CMC joint)
  • type B: small nubbin of non-functioning tissue or additional soft tissue on a pedicle

Or, you can use a separate three-part classification system:

  • type I: nubbin or floating digit
  • type II: duplications at the MCPJ
  • type III: duplication of the entire ray
Associations

Post-axial polydactyly can be associated with:


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Article Information

rID: 15588
Tag: cases
Synonyms or Alternate Spellings:
  • Post-axial polydactyly
  • Polydactyly - post axial

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