Arthroscopic reduction-association of the scapholunate

Abstract

The reduction-association scapholunate (RASL) procedure for stabilization of the scapholunate joint is an alternative to soft-tissue procedures that do not maintain normal carpal alignment, despite reports of good symptomatic relief. The RASL procedure--indicated for patients with scapholunate instability or scapholunate dissociation without arthritis and, in selected cases, with stage 1 scapholunate advanced collapse of the wrist--can be performed arthroscopically. Radial midcarpal and 3-4 radiocarpal portals are used to excoriate and prepare the scapholunate joint surfaces. By use of 0.62'' K-wire joysticks in the lunate and distal pole of the scaphoid, the scaphoid undergoes dorsiflexion and supination while the lunate undergoes palmarflexion to achieve reduction. A .35'' guidewire is advanced through the scaphoid waist, across the scapholunate joint to the proximomedial corner of the lunate. Supplemental K-wire fixation, from the scaphoid to the capitatum and lunate to the radius, stabilizes the reduction for placement of a cannulated HBS screw (Orthosurgical Implants, Miami, FL) through a 1-2 portal, while reduction and positioning are confirmed arthroscopically. Arthroscopy facilitates anatomic reduction of the joint, as well as the critically important, precise placement of the cannulated HBS screw, by use of 3 portals rather than the traditional 2-incision approach.