The ulnolunate ligament is the medial component of the palmar ulnocarpal ligament complex, arising from the ulnar styloid base and fovea to insert on the proximal and medial surfaces of the lunate. It works together with the ulnotriquetral ligament to stabilise the ulnar carpus and transmit compressive load across the ulnar side of the wrist.
Restrains the lunate against excessive radial deviation and carpal supination, transmits axial load from the ulnar carpus to the ulna, and contributes to the overall stability of the distal radioulnar joint complex.
Ulnolunate ligament tears are associated with TFCC disruptions and ulnar-sided wrist pain, typically from a fall on an outstretched hand or repetitive rotational loading. Diagnosis requires MRI arthrography as conventional MRI has limited sensitivity. Arthroscopic inspection is the gold standard. Combined ulnolunate and ulnotriquetral tears produce significant ulnocarpal instability requiring ligament repair or reconstruction.
Disruption of the ulnolunate ligament, often concurrent with TFCC tears, causing ulnar-sided wrist pain, reduced grip strength, and a positive ulnocarpal stress test, diagnosed definitively by wrist arthroscopy.
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