The triquetrum is a pyramid-shaped carpal bone on the medial side of the proximal row that articulates with the pisiform anteriorly and the hamate distally, and bears the impact of ulnar-sided wrist trauma.
The triquetrum articulates with the TFCC rather than the radius, making it part of the medial column of the carpus. Triquetrum dorsal chip fractures from dorsal impaction are the second most common carpal fracture after the scaphoid. Lunotriquetral ligament tears from a FOOSH produce ulnar wrist pain reproduced by the lunotriquetral shear test (Reagan ballottement test).
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