Kappa: Preliminary Results on a Novel Technique for Pelvic Fixation in Adult Spinal Deformity Correction.

Abstract

Retrospective cohort study. Pelvic fixation in degenerative spinal deformation is as crucial as demanding. Several pelvic anchoring technics have been described, but loosening rates remain high for most solutions. Here is described the "Kappa" technic, combining ilio-sacral screws to S2A1 screws at 2years of follow-up. Thirteen patients that underwent a spinal deformity correction with "Kappa" fixation to the pelvis and with more than 2years of follow-up were prospectively included in this study. The surgical technic is described, and clinical and radiographic data have been collected for all patients. The population exhibited an important pre-operative sagittal imbalance (mean SVA of 104,4mm, mean PI-LL mismatch of 22,8°) that had improved significatively after surgery (mean SVA of 75,5mm and mean PI-LL mismatch of 4,9°). No loosening of pull-out of the implants was to deplore at 2years of follow-up. The association of ilio-sacral screw, resistant to pull-out because of the traction axis perpendicular to the construct, to S2A1 screws, known to be effective in sagittal balance restoration seems to be an effective and safe option to pelvic fixation for adult spinal deformity correction. IV.