The wrist extrinsic ligament system comprises all the ligaments connecting the radius and ulna to the carpus (radiocarpal and ulnocarpal extrinsic ligaments), providing the primary carpal stability from outside the carpus itself.
Provides the primary carpal stability against displacement, constrains the proximal carpal row within the radiocarpal joint, and works with the intrinsic intercarpal ligaments to maintain normal carpal kinematics.
The extrinsic carpal ligaments are the first line of defence against carpal instability — their failure precedes intrinsic ligament disruption in progressive carpal instability patterns. The space of Poirier (gap between the volar extrinsic ligaments) is the site of perilunar dislocation.
Carpal dislocation progressing through the volar extrinsic ligament weak point (space of Poirier) with the lunate remaining in the lunate fossa, the most severe carpal instability pattern requiring urgent surgical reduction and ligament repair.
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