Lunotriquetral coalition 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, fibrocartilaginous lunotriquetral coalitions can present as an uncommon cause of ulnar-sided wrist pain often due to the pseudarthrosis or a post-traumatic disruption .
- coalition may be fibrous, cartilaginous or osseous
- commonly bilateral
Carpal coalitions can follow an autosomal dominant route of inheritance
de Villiers classified lunotriquetral coalition into four types :
- coalition of the lunate and triquetrum
- may be accompanied by a widened scapholunate interval
Treatment and prognosis
Most commonly an incidental finding. May occasionally be the cause of chronic wrist pain (especially in types 1 and 2 ) and, of course, can be fractured.