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Correction of adolescent idiopathic thoracic scoliosis with a new type of offset apical instrumentation: preliminary results.

Twenty patients were operated on with the same method using the AO Universal Spine System. The entire apex of the curvature was instrumented on the concave side with a newly designed pedicle hook augmented by 3.2-mm endplate screw. An offset configuration of apical and end vertebrae implants was done to maximize translation. The concave rod was derotated to 120 degrees without any distraction. The convex side was instrumented in the usual fashion. Prospective analysis showed a mean Cobb angle correction of 63% for a mean preoperative angle of 54 degrees. The apical vertebral translation was corrected to 72%. There was no major complication at the last follow-up (18-30 months). This technique compares favorably with the ones using CD principles, but needs no distraction and no instrumentation in the canal (supra or infralaminar hook).