The triquetrocapitate ligament is a palmar extrinsic ligament connecting the triquetrum to the capitate, forming part of the ulnar arm of the palmar V ligament (arcuate ligament) system.
Provides ulnar midcarpal stability, contributes to the ulnar arm of the palmar midcarpal ligament system, and resists VISI (volar intercalated segment instability) deformity of the lunate.
The triquetrocapitate ligament is deficient in ulnar-sided midcarpal instability (VISI pattern), where the lunate flexes volarly rather than extending. Triquetrocapitate ligament reconstruction combined with lunotriquetral fusion addresses refractory VISI instability.
Ulnar midcarpal instability from triquetrocapitate and lunotriquetral ligament laxity producing volar lunate tilting, managed by triquetrolunate fusion and midcarpal ligament reconstruction.
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