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Objective: To create a new instrumentation principle for the treatment of adolescent idiopathic scoliosis (AIS) and similar conditions. Methods: A new fixation format was created for the treatment of AIS using 3rd generation instrumentation in short, apical and single or multiple fixations. In patients presenting one scoliotic curve, one fixation is performed. In patients with two curves, two fixations are performed, and in those with three curves, three fixations are performed. To evaluate the new method, a retrospective study of 54 patients who had already undergone surgery for AIS and similar conditions using this innovation was conducted. Results: In this series, average corrections of 72% in the proximal curve, of 83% in the thoracic curve, and of 85% in the thoracolumbar curve were verified. Conclusions: It was concluded that the new fixation principle in the treatment of AIS and similar conditions using short, apical and multiple fixations presented excellent correction, better still in the curves that were more distal in relation to the spine. There was a significant statistical difference between the percentages of curvature correction. Level of Evidence III; Retrospective study.

ADOLESCENT IDIOPATHIC SCOLIOSIS AND SIMILAR CONDITIONS: SHORT, APICAL, SINGLE OR MULTIPLE FIXATION