Radiographic results of posterior corrective surgery utilizing 2 different stiffness rods of 6.35mm diameter for adolescent idiopathic scoliosis

Surgical techniques There are three major unique points in our technique. 1) Pedicle screws (PS) were inserted when preoperative evaluation revealed that pedicles weren’t too narrow for screw placement. Uniplanar or reduction screws were used at the apical concave side for ease in locking rod of concave side. We tended to use high density PS on the convex side. 2) After the PS was positioned, a prebend pure-titanium 6.35mm rod was locked to the PSs on the convex side. Subsequently we performed rod derotation and in-situ bending maneuver at the convex side. These can correct deformity in the coronal and sagittal plane. We used pure-titanium 6.35mm rod to prevent fattening while performing rod rotation and for ease in in-situ bending maneuver. 3) After correction of spinal deformity was obtained by convex rod, a prebend titanium-alloy 6.35mm rod was locked to the PSs on the convex side to support and maintain the corrected curvature. Vertebral column derotation and compressiondistraction maneuver was added after the placement of the second rod.