Luno-triquetral coalition

Luno-triquetral coalition is the most common type of carpal coalition and represents a congenital fusion of the lunate and triquetral bones of the carpus. 

Lunotriquetral is the most common type of carpal coalition with a prevalence of 0.1%. It is more common in females (F:M = 2:1) and African Americans.

Whilst osseous coalitions of the lunate and the triquetrum are known to be asymptomatic, fibrocartilage lunate-triquetral coalitions can present an uncommon cause of ulnar-sided wrist pain 3.  

  • coalition may be fibrous, cartilaginous or osseous 5
  • commonly bilateral 4
Classification

de Villiers classified lunotriquetral coalition into four types 6:

  1. incomplete (or fibrocartilage) fusion - resembles a pseudo-arthrosis
  2. incomplete osseous fusion 
  3. complete osseous fusion
  4. complete osseous fusion with other carpal abnormalities
Plain radiograph
  • coalition of the lunate and triquetrum
  • may be accompanied by widened scapholunate interval 4 

Most commonly an incidental finding. May occasionally be a cause of chronic wrist pain (especially in type 1 and 2 6) and, of course, can be fractured. 

Upper limb anatomy
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Article Information

rID: 18298
Section: Anatomy
Tags: variant, wrist
Synonyms or Alternate Spellings:
  • Lunate-triquetral coalition
  • Lunato-triquetral coalition
  • Triquetral-lunate coalition
  • Lunotriquetral coalition

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Cases and Figures

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    Case 1
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    Case 2
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    Case 3
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    Case 4
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     Case 5
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    Case 6
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    Case 7
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    Case 8: ultrasound
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    Case 9
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    Case 10: with concurrent capito-hamate coalition
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