The triquetrohamate ligament is one of the palmar intrinsic midcarpal ligaments, with a variable presence of a dorsal component of the ligament 1. Its function is to resist flexion between the triquetrum and the hamate 1. Together with the triquetrocapitate ligament, it forms the triquetrohamocapitate ligament, which forms the ulnar limb of the arcuate ligament of the wrist 2.
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Gross anatomy
The triquetrohamate ligament attaches proximally at the distal margin of the palmar cortex of the triquetrum and distally at the palmar cortex of the hamate, running ulnar to the triquetrocapitate ligament 3.
Radiographic features
MRI
The triquetrohamate ligament may be seen as a mirror image of the orientation of the scaphotrapeziotrapezoid (STT) ligament running between its two attachments obliquely on the volar and sometimes dorsal aspects of the wrist 3. It may be best viewed on a sagittal plane, with a normal orientation of the wrist (no ulnar or radial deviation), but it can also often be seen on a coronal plane 4. It may be more easily viewed with MR arthrography 4.
Related pathology
The presence of a dorsal triquetrohamate ligament is variable and, when present, is often confused with the distal extension of the extensor carpi ulnaris tendon sub sheath 3.
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