The palmar component of the scapholunate interosseous ligament is the thicker, more vascularised portion connecting the palmar scaphoid to the palmar lunate. Paradoxically, it is biomechanically weaker than the dorsal component in resisting rotational forces.
Provides the palmar constraint of the SL articulation, is the component repaired in acute SL ligament injury, and contains the vascular supply that makes it more amenable to healing than the avascular dorsal component.
The palmar SL ligament fails secondarily in acute SL disruptions, with the dorsal SL ligament being the primary mechanical constraint. Repair of the palmar component in acute injury improves rotational stability but dorsal SL repair is the primary stabilising procedure.
Primary repair of the palmar scapholunate ligament in acute wrist injury alongside dorsal SL ligament repair, restoring the complete SL constraint system for optimal rotational stability.
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