Residual Thoracic Hypokyphosis After Posterior Spinal Fusion and Instrumentation in Adolescent Idiopathic Scoliosis

• DOI: 10.1097/brs.0b013e318216106c
• Publication Date: 2011-02-26T16:29:50Z
• Authors: Nicholas D. Fletcher; Hopkins Jeffrey; McClung Anna; Richard Browne; Daniel J. Sucato
• Keywords: Kyphosis; Idiopathic scoliosis; Cobb angle; Thoracic vertebrae

A retrospective review of clinical and radiographic data from a single-center, prospectively collected scoliosis database.To assess risk factors for persistent thoracic hypokyphosis after posterior spinal fusion instrumentation (PSFI) adolescent idiopathic (AIS) to compare outcomes between patients with residual those normal kyphosis PSFI AIS.AIS is characterized by hypokyphosis, which should be corrected at the time surgical treatment. Risk ramifications have not been studied.Radiographic assessments using Scoliosis Research Society-30 (SRS-30) Spinal Appearance Questionnaire (SAQ) were done preoperatively 2 years. Patients divided into groups on basis threshold 20° measured T5 T12 2-year follow-up.Risk being hypokyphotic years male sex (21.69% vs. 12.21%, P = 0.084), preoperative (11.4° 22.8°, < 0.0001), smaller main coronal curves (58.4° 62.0°, 0.004). total 71.5% instrumented 6.35-mm rods had compared 47.0% 5.5-mm (P 0.0043). All-pedicle screw constructs remained hook-based 0.035). Logistic regression analysis demonstrated parameters associated years: larger rod diameter. Both similar results SRS-30 follow-up > 0.05). There was small but statistically significant correlation sagittal Cobb angle deformity based components SAQ.There are that lead in AIS: use 5.5-mm-diameter rod. larger-diameter considered when planning surgery AIS, especially there hypokyphosis. Despite measuring less than 20°, these did decreased as or SAQ.