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Clinical outcome and radiographic results after operative treatment of Scheuermann's disease.
European Spine Journal 2002 December
The aim of this prospective study was to evaluate radiographic findings, patient satisfaction and clinical outcome, and to report complications and instrumentation failure after operative treatment of Scheuermann's disease using a combined anterior and posterior spondylodesis. The loss of sagittal plane correction after removal of the posterior instrumentation was analysed. The indication for surgery was a thoracic kyphosis greater than 60 degrees in adolescents and adults with persistent back pain, which failed to respond to conservative treatment. Thoracic kyphosis and lumbar lordosis angles were measured by the Cobb method at preselected time points and at final follow-up. Sagittal plane alignment was measured as translation. The validated Scoliosis Research Society Instrument (SRSI) questionnaire was sent to all patients at follow-up. P-values were calculated using the Wilcoxon signed rank test (P<0.05 is significant). Between October 1987 and August 1999, 23 consecutive patients underwent operative treatment. The median follow-up was 75 months (range 25-126 months). Median preoperative thoracic kyphosis was 70 degrees (range 62 degrees-78 degrees) and median preoperative lumbar lordosis was 68 degrees (range 54 degrees-84 degrees). Immediate postoperative median thoracic kyphosis was 39 degrees (range 28 degrees-54 degrees) (P<0.05) and immediate postoperative median lumbar lordosis was 49 degrees (range 35 degrees-63 degrees) (P<0.05). These significant corrections were maintained at early follow-ups conducted 1 year and 2 years postoperatively. At final follow-up, the median thoracic kyphosis had significantly increased, to 55 degrees (range 36 degrees-65 degrees) (P<0.05 relative to immediate postoperative value), and the median lumbar lordosis had increased to 57 degrees (range 44 degrees-70 degrees) (P<0.05). The late deterioration of correction in the sagittal plane was mainly caused by removal of the posterior instrumentation, and occurred despite radiographs, bone scans and thorough intra-operative explorations demonstrating solid fusions. The median SRSI score was 83 points (range 55-106). There was no significant correlation between the radiographic outcome and the SRSI score (P>0.05). Our series showed relatively fair outcome after operative treatment in Scheuermann's disease. Therefore, the indication for surgery in patients with Scheuermann's disease can be questioned.
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