All patients with idiopathic thoracolumbar or lumbar scoliosis treated by a single surgeon with a single-stage fusion with Zielke instrumentation and a minimum 2-year follow-up ware reviewed. Thirty-two patients were reviewed (94% follow-up), 13 adolescents end 19 adults. All patients were evaluated clinically and radiographically, as well as psychologically. There were no major complications. This average curve correction was 73%. The instrumentation was kyphogenic, but this did not affect the overall sagittal contour or the clinical results. Back pain was significantly improved, as was cosmesis. The Zielke device was found to be an effective device for the correction of thoracolumbar and lumbar curves in selected adolescents and adults.