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Related Experiment Videos

Complex dorsal dislocation of the second carpometacarpal joint.

P K Ho1, S J Choban, S J Eshman

  • 1Department of Orthopedic Surgery, Naval Hospital, Portsmouth, Va.

The Journal of Hand Surgery
|November 1, 1987
PubMed
Summary

Isolated index finger carpometacarpal joint dislocation is rare. This case highlights the extensor carpi radialis brevis tendon as a cause of irreducible dorsal dislocation, requiring open reduction.

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Area of Science:

  • Orthopedic Surgery
  • Hand Surgery
  • Traumatology

Background:

  • Carpometacarpal (CMC) joint injuries are uncommon, with isolated index finger CMC joint dislocations being particularly rare.
  • Dorsal dislocations are the most frequent type of CMC joint injuries.
  • Understanding the mechanisms of irreducible dislocations is crucial for effective treatment.

Observation:

  • A case of isolated dorsal dislocation of the second carpometacarpal joint is presented.
  • The dislocation was not amenable to closed reduction.
  • Surgical exploration revealed the extensor carpi radialis brevis tendon interposed within the joint.

Findings:

  • The interposition of the extensor carpi radialis brevis tendon was identified as the cause of the irreducible dislocation.

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  • This anatomical structure blocked successful closed manipulation.
  • Open reduction was necessary for successful joint realignment.

    • Implications:

    • This case underscores the importance of considering soft tissue interposition in irreducible carpometacarpal joint dislocations.
    • Accurate diagnosis and surgical planning are essential for managing such rare hand injuries.
    • Awareness of this specific mechanism can improve surgical outcomes for index finger CMC joint dislocations.