Description
The pisiform forms a pisotriquetral joint with the palmar surface of the triquetrum. This articulation is small, oval, and almost flat and is surrounded by a thin articular capsule. The pisotriquetral ligament holds the pisiform in place on the triquetrum. Additionally, the pisiform is stabilized by the pisohamate and pisometacarpal ligaments, which attach the pisiform to the hook of hamate and the proximal part of the fifth metacarpal, respectively.
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Pisiform Bone
1 The pisiform bone is a sesamoid bone that articulates flat with the triquetral bone but derives all of its stability from the flexor carpi ulnaris tendon, which continues distally into the pisohamate and pisometacarpal ligaments.
