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Derotational Analysis of Cotrel‐Dubousset Instrumentation in Idiopathic Scoliosis

Ten patients with idiopathic scoliosis were treated with posterior spinal fusion and Cotrel-Dubousset instrumentation. Computed tomographic scans and intraoperative photographs were used to evaluate the derotational effect of the Cotrel-Dubousset instrumentation. The frontal deformity was corrected from an average of 51 ± to 15± and the kyphosis from 9.5° to 18°. The amount of preoperative vertebral rotation was variable, however, and insignificant postoperative changes were documented in the majority of cases.