Fusions ending at the thoracolumbar junction in adolescent idiopathic scoliosis: comparison of lower instrumented vertebrae.

Study Design: Retrospective cohort study.

Objective: To compare clinical outcomes and radiographic parameters between patients treated with a posterior spinal fusion that had a lower instrumented vertebra at T11, T12, and L1.

Background: Posterior instrumented fusions are well established for treating patients with adolescent idiopathic scoliosis (AIS).