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Clinical features

Authoring team

The clinical features of ulnar dysplasia are very variable and usually less conspicuous than radial dysplasia:

  • ulna hypoplasia (most common) or absence
  • ulnar deviation at the wrist
  • radius curved
  • radial head dislocation
  • hypoplasia of upper limb
  • absences of metacarpals or digits (90%)
  • syndactyly in a minority
  • thumb or first web anomaly, but the extent of this does not bear any relation to the forearm anomaly

There may be associated generalised musculoskeletal dysplasias.


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