The capitotrapezoid ligament (or trapezocapitate ligament) is one of the three distal interosseous ligaments of the wrist 1,2. It acts along with the capitohamate and trapeziotrapezoid ligaments to stabilize the distal row of carpals and keep them moving as a single unit 1,2.
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Gross anatomy
Each of the distal interosseous ligaments has volar, dorsal, and interosseous parts 2. The dorsal and volar parts of the capitotrapezoid ligament span almost the entire length of the joint edges on the trazpezoid side, with extensive coverage of the cortex of the trapezoid, but insert into only the body of the capitate 3. The deep part of the ligament runs obliquely in a notch between the articulating surfaces of the trapezoid and the capitate 3.
Radiographic features
MRI
The capitotrapezoid ligament may be seen running between its attachments on the trapezoid and the capitate and may be best viewed on axial and coronal planes with normal orientation of the wrist (no ulnar or radial deviation). It may also be more easily visualized with MR arthrography 4.
Related pathology
The distal row ligaments are generally stronger than the ligaments in the proximal row and are rarely torn 1,2.
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