Lunotriquetral coalition

Case contributed by Dr Samir Benoudina


Wrist pain after soccer injury.

Patient Data

Age: 20 years
Gender: Male

Incidental complete fusion of the lunate and triquetrum representing an osseous luno-triquetral coalition.

Mild positive ulnar variance.

No acute bony injury.

Annotated image
  • luno-triquetral osseous coalition
  • positive ulnar variance.

Case Discussion

Carpal coalitions are rareThe luno-triquetral coalition is the most common followed by capito-hamate. It is generally asymptomatic especially when the coalition is osseous, as is it in this case.

Positive ulnar variance describes where the distal articular surface of the ulna is more distal as compared to the articular surface of the radius. It is associated with ulnar impaction syndrome and triangular fibrocartilage tears.

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