Does surgery for Scheuermann kyphosis influence sagittal spinopelvic parameters?

Purpose To analyze changes in sagittal spinopelvic parameters (SSPs) after surgical treatment of Scheuermann's Kyphosis (SK). Methods We analyzed 20 patients affected by SK and subjected to posterior correction of the kyphosis by facetectomy, Ponte osteotomy, fusion and multilevel instrumentation with pedicle screw system. Four spinal and three pelvic parameters were measured: sagittal vertical axis (SVA), thoracic kyphosis (TK), thoracolumbar kyphosis, lumbar lordosis (LL), pelvic incidence (PI), sacral slope (SS) and pelvic tilt (PT). Analysis of changes in postprocedural SSPs compared to preoperative values was performed. Results TK passed from 78.6 degrees preoperatively to 45.8 degrees (p = 0.003). LL passed from 74.5 degrees preoperatively to 53.5 degrees (p = 0.01). No significant changes occurred in SVA, SS, PT and PI compared to preoperative values. Conclusion We confirm the positive effect of surgery by Ponte osteotomy and posterior spinal fusion on TK and LL in patients with SK. In our experience, pelvic parameters did not change after surgery.