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Ulnar Collateral Ligament of the Thumb

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(Redirected from Thumb UCL)

Description

Diagram of a normal ulnar collateral ligament complex. pUCL (proper ulnar collateral ligament), aUCL (accessory ulnar collateral ligament)[1]
Proper and accessory UCLs reciprocally tlghten as the MCP joint extends and flexes. On extension (a) the proper UCL is lax and the accessory ligament is taut; in flexion (b) the proper UCL is taut and the accessory ligament is lax[2]

Names

  • Ulnar Collateral Ligament of the Thumb
  • Thumb UCL
  • Thumb Ulnar Collateral Ligament
  • UCL of the Thumb
  • Thumb MCP Ulnar Collateral Ligament
  • First Metacarpophalangeal Ulnar Collateral Ligament
  • Medial Collateral Ligament of the Thumb
  • Thumb Collateral Ligament
  • Thumb MCP Ligament

Anatomy

Proper Collateral Ligament (PCL)

Accessory Collateral Ligament (ACL)

  • Origin just palmer to the PCL
  • Runs parallel to the PCL and also inserts on the proximal phalanx and volar plate

Function

  • Prevents abduction or valgus/ radial deviation of the thumb at the 1st MTPJ
  • Ensure the ulnar and volar stability of the base of the thumb
  • UCL Proper: tight in flexion, relaxion in extension of MCPJ
  • Accessory UCL: tight in in extension, relaxes in flexion

Clinical Significance

See Also

References

  1. ↑ McKeon, Kathleen E., Richard H. Gelberman, and Ryan P. Calfee. "Ulnar collateral ligament injuries of the thumb: phalangeal translation during valgus stress in human cadavera." JBJS 95.10 (2013): 881-887.
  2. ↑ McCue III, Frank C., and William E. Nelson. "Ulnar collateral ligament injuries of the thumb." The Physician and Sportsmedicine 21.9 (1993): 66-80.
Created by:
John Kiel on 2 November 2024 13:57:56
Authors:
Last edited:
9 May 2026 20:12:01
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