- Congenital fusion of the lunate and triquetral bone.
- Most common carpal coalition. Companion question: Which is the most tarsal coalition? Let me know in the comments below!
- Like all coalitions it can be osseous, fibrous or cartilaginous. The latter two would be difficult to pick up on radiographs.
- Asymptomatic in most cases requiring no further management.
- Associated syndromes with lunotriquetral fusion:
- Dyschondrosteosis
- Banki syndrome
- Turner syndrome.
Normal anatomy of carpal bones:
Mnemonic for carpal bones: She Looks Too Pretty, Try To Catch Her (radial to ulnar)
Proximal row
- Scaphoid -MC carpal bone to fracture
- Lunate
- Triquetral
- Pisiform – Smallest carpal bone.
Distal row
- Trapezium
- Trapezoid
- Capitate – Largest carpal bone
- Hamate
More radiology mnemonics 👇
Case shared by Dr. Utkarsh Bhingare.
References:
- Lunotriquetral Coalition: An Unusual Cause of Wrist Pain
- https://www.scientificanimations.com, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
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