Abstract
The SL ligament complex and volar radiocarpal ligaments provide scaphoid stability both at the SL joint and, more importantly, at its distal radius articulation. With disruption or attenuation of these ligaments, rotational displacement of the scaphoid occurs about its longitudinal axis. This results in distal scaphoid flexion and proximal pole subluxation dorsally, toward the distal radius rim. Rotary subluxation of the scaphoid accurately describes this condition, and represents a spectrum of radioscaphoid instability based upon the severity and chronicity of ligamentous disruption. Diagnosis is based upon identification of specific clinical and radiographic features. Recognition of this entity provides for a more rational basis for treatment of ligamentous injuries of the wrist.
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