The ulnotriquetral ligament forms the lateral component of the palmar ulnocarpal complex, running from the fovea of the ulnar styloid to the palmar and medial surface of the triquetrum. It is consistently present and thicker than the ulnolunate ligament, making it the primary stabiliser of the ulnar carpus.
Stabilises the triquetrum and ulnar carpus, limits triquetral displacement during forearm rotation and ulnar deviation, and contributes to load transmission across the ulnocarpal joint.
Isolated ulnotriquetral ligament tears can result from forced wrist extension with ulnar deviation, producing ulnar-sided wrist pain localised to the pisotriquetral and lunotriquetral area. The ligament is directly visualised during ulnar wrist arthroscopy. Chronic tears lead to lunotriquetral complex instability. Arthroscopic debridement or repair is performed depending on tear pattern and acuity.
Disruption of the ulnotriquetral and lunotriquetral ligaments allows abnormal triquetral motion, producing a clunking sensation with radial and ulnar deviation and a positive lunotriquetral shear (Reagan) test.
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