The interosseous carpometacarpal ligaments are short, stout bands directly connecting the carpal and metacarpal bones at the CMC joint level, providing the deep interosseous constraint of the CMC articulations.
The strongest of the CMC ligaments, connecting the carpals and metacarpal bases directly through the joint line. Resist CMC joint separation during axial loading and contribute to the rigid arch of the central CMC joints (index and middle) versus the mobile arch of the border CMC joints (ring and little).
The interosseous CMC ligaments are the basis of the natural rigidity of the central hand — the index and middle CMC joints are almost immobile while the ring and little CMC joints have 15-25 degrees of mobility. This differential mobility must be considered in hand function assessment and reconstruction.
Disruption of the interosseous carpometacarpal ligaments in crush or blast injuries producing CMC instability requiring percutaneous or open stabilisation.
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