Trapeziotrapezoid ligament

Last revised by Henry Knipe on 10 Aug 2023

The trapeziotrapezoid ligament is one of the three distal interosseous ligaments of the wrist 1,2. It acts along with the capitotrapezoid and capitohamate ligaments to stabilize the distal carpal row and keep them moving as a single unit 1,2.

Each of the distal interosseous ligaments has volar, dorsal, and interosseous parts 2. The dorsal and volar parts of the trapeziotrapezoid ligament span almost the entire length of the joint edges of the trapezium and trapezoid, and cover a large part of the cortexes of either bone 3. The deep part of the ligament has not been consistently well described 1-3.

The trapeziotrapezoid ligament may be seen running between its attachments on the trapezium and the trapezoid and may be best viewed on axial and coronal planes with normal orientation of the wrist. It may also be more easily visualized with MR arthrography 4. Radial and ulnar deviation may make visualization in the axial and coronal planes, respectively, more difficult 4.

The distal row ligaments are generally stronger than the ligaments in the proximal row and are rarely torn 1,2.

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