Severe thoracolumbar congenital kyphosis treated with single posterior approach and gradual "in situ" correction.

Background: Congenital kyphosis results from the failed formation of the vertebrae during the embryonic period and may be associated with cardiac, urogenital, or spinal cord anomalies. Surgical treatment is the best choice through anterior, posterior, or both approaches. Objectives: This study aims to evaluate the effect of posterior gradual correction using the "in situ" bender to correct severe thoracolumbar congenital kyphosis with or without osteotomy or excision of the vertebra. Methods: Twenty-five patients with an age range of 2-23 (mean +/- SD = 12.58 +/- 6.03) years with severe thoracolumbar kyphosis were treated surgically at our institution between 2004 and 2013. Pedicle screwing, osteotomy, and gradual "in situ" bending through the single posterior approach were the choices of treatment. Cobb's angle, patient's height, and SRS-22r were used to evaluate the patients preoperatively and postoperatively. Follow-up periods were 35-136 months. Result: Cobb's angle pre-surgery range was 35-180 (81.48 +/- 39.1) degrees improved post-surgery to 0-45 (21.72 +/- 13.47) degrees (p-value <0.0001). The range of patients' standing height pre-surgery was 79-170 (142.42 +/- 24.85) centimeters increased after surgery to 81-175 (147.76 +/- 26.33) centimeters (p-value <0.0001). SRS-22r pre-surgery range was between 2.12 and 3.904 (3.2 +/- 0.77) and improved post-surgery to 4.16 and 4.96 (4.59 +/- 0.29) (p-value = 0.046). Conclusion: Gradual correction with the "in situ" bender with or without osteotomy through the single posterior approach can give satisfying clinical (patients' standing height and SRS-22r scores) and radiological (Cobb's angle) results to treat severe congenital thoracolumbar kyphosis.