Hitchhiker thumb deformity

Dr Aditya Shetty et al.

Hitchhiker thumb deformity refers to:

  • flexion of the metacarpophalangeal (MCP) and
  • extension of distal interphalangeal joint of the thumb

It is similar to how a person would normally angulate and hold out the thumb with the intension to hitchhike. It is one of the musculoskeletal manifestations of rheumatoid arthritis in the hand although not entirely specific for this diagnosis.

The sign is also used in obstetrical ultrasound to describe the appearance of the fingers in diatrophic dysplasia.

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Article information

rID: 28019
Section: Signs
Tags: shetty, refs, cases
Synonyms or Alternate Spellings:

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