The volar wrist capsular ligaments are the reinforcing bands on the palmar aspect of the radiocarpal joint, including the volar radioscaphocapitate, long radiolunate, short radiolunate, and ulnolunate ligaments, providing the primary volar radiocarpal constraint.
Provide the primary wrist stability — the volar radiocarpal ligaments are stronger than the dorsal, resisting carpal dorsal displacement, limiting wrist extension, and anchoring the lunate during loading.
The space of Poirier (a weak area in the volar wrist capsule between the volar radiolunate and radioscaphocapitate ligaments) is the point of entry for volar lunate dislocations — the lunate escapes into the carpal tunnel through this space in perilunate-lunate dislocation.
The volar capsular weak point between the volar wrist ligaments allows lunate escape anteriorly in perilunate-lunate dislocation, producing median nerve compression from carpal tunnel invasion by the displaced lunate.
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