Comparison of Compensatory Curve Spontaneous Derotation After Selective Thoracic or Lumbar Fusions in Adolescent Idiopathic Scoliosis

Retrospective review of a multicenter prospectively collected series of adolescent idiopathic scoliosis (AIS) patients. To compare uninstrumented compensatory curve spontaneous derotation of the rib hump and lumbar prominence after selective lumbar or thoracic fusions in AIS. Coronal correction of the unfused minor curve after selective fusions in AIS has been well-documented previously. However, little has been reported regarding spontaneous correction in the axial plane of the unfused minor curve after selective AIS surgery. Patients with minimum 2-year follow-up after either a selective thoracic fusion (STF) (lowest instrumented vertebrae L2 or above), or a selective lumbar fusion (upper instrumented vertebrae T9 or below) for AIS, with an initial scoliometer value of >or=5 degrees in the minor curve were analyzed. Prospectively acquired preoperative and 2-year postoperative radiographic and scoliometer measurements of both the fused and unfused curves were compared using repeated measures and univariate analysis of variance. The data were checked for normality and equal variances, and the level of significance was set at P