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The fourth carpometacarpal joint.

S F Viegas1, M Crossley, M Marzke

  • 1Division of Orthopaedic Surgery, University of Texas Medical Branch, Galveston 77550.

The Journal of Hand Surgery
|May 1, 1991
PubMed
Summary
This summary is machine-generated.

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The study found significant variations in the fourth metacarpal base and its joint articulation in cadaveric wrists. Radiographs can identify the presence of this articulation and the general shape of the metacarpal base.

Area of Science:

  • Anatomy
  • Orthopedics
  • Radiology

Background:

  • Carpometacarpal joint morphology exhibits considerable variation.
  • Understanding the anatomy of the fourth metacarpal base and its articulation is crucial for diagnosing and treating wrist conditions.

Purpose of the Study:

  • To investigate the anatomical variations of the second through fifth carpometacarpal joints.
  • To characterize the shapes of the fourth metacarpal base and the presence of its articulation with the hamate/capitate bones.

Main Methods:

  • Dissection of 142 cadaveric wrists.
  • Classification of the shapes of the second through fifth carpometacarpal joints.
  • Assessment of the fourth metacarpal base morphology and its articulation with carpal bones.

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Main Results:

  • Five distinct shapes of the fourth metacarpal base were identified.
  • The fourth metacarpal base was predominantly flat (85.9%) or conical (14.1%).
  • A fourth metacarpal/capitate articulation was present in 81.7% of specimens and identifiable via radiographs.

Conclusions:

  • The fourth metacarpal base and its articulation with carpal bones display significant anatomical variability.
  • Radiographic assessment can reliably determine the presence of the fourth metacarpal/capitate articulation and the general shape of the metacarpal base.