Determination of Distal Fusion Level With Segmental Pedicle Screw Fixation in Single Thoracic Idiopathic Scoliosis

Abstract

In single thoracic idiopathic scoliosis, NV is an important factor for the determination of fusion level. When preoperative NV and EV show no more than two-level gap differences, the curve should be fused down to NV. When the gap is more than two levels, fusion down to NV-1 is satisfactory, saving one or two motion segments, as compared with fusion extending to the stable vertebra.