Palmar Radiocarpal Ligament

ligamentum radiocarpale palmare

The palmar radiocarpal ligaments run from the palmar rim of the distal radius to the proximal carpal row (radioscaphocapitate and long radiolunate ligaments), forming the primary palmar wrist capsular reinforcement. They are the strongest wrist ligaments and the primary restraints to dorsal carpal instability.

Region: Forearm

Biomechanics

Function & Actions

Primary palmar restraint of the radiocarpal joint; prevents dorsal translation of the carpus; the radioscaphocapitate is the primary stabiliser of the scaphoid.

Clinical Relevance

Clinical Notes

The palmar radiocarpal ligaments are disrupted in perilunate dislocations, which progress along the lesser arc of injury. The radioscaphocapitate ligament creates the space of Poirier, a weak point where perilunate dislocation occurs. Repair of these ligaments during perilunate dislocation reduction is essential for carpal stability. Radiocarpal ligament tears are visualised on wrist MRI arthrography.

Pathology

Common Injuries & Conditions

Perilunate Dislocation

Disruption of the palmar radiocarpal and intercarpal ligaments from high-energy wrist hyperextension producing dorsal carpal dislocation around the intact lunate, managed by emergent closed or open reduction and ligament repair.