Monoaxial pedicle screws with sublaminar fixations in the correction of adolescent idiopathic scoliosis

Abstract

Objective: To evaluate the radiological outcomes of posterior spinal instrumentation by using monoaxial pedicle screws with sublaminar fixations for the treatment adolescent idiopathic scoliosis (AIS). Materials and Methods: The data of 14 patients who underwent posterior instrumentation by using monoaxial pedicle screws with sublaminar fixations for the treatment of AIS between 2010 and 2019 were retrospectively analyzed. Patients’ age, gender, preoperative Risser classification, preoperative Lenke classification, and operative data were recorded through our medical records. Proximal thoracic (PT), main thoracic (MT), thoracolumbar/lumbar (TL/L) curve Cobb angles as well as thoracic kyphosis (TK) and lumbar lordosis (LL) Cobb angles were measured through preoperative and postoperative standing full spine X-rays. Results: The mean preoperative PT curve Cobb angle was 33.7 degrees, and it was 4 degrees postoperatively (p=0.068). The mean preoperative MT curve Cobb angle was 53.3 degrees and it was 8.7 degrees postoperatively (p=0.008). The mean preoperative TL/L curve Cobb angle was 43 degrees and it was 9.2 degrees postoperatively (p=0.005). The overall mean coronal plane correction ratio was 84%. The mean preoperative TK Cobb angle was 25.2±17.8 degrees and it was 32.9±8.9 postoperatively (p=0.101). Conclusion: According to the results acquired from this study, monoaxial pedicle screws with sublaminar fixations demonstrated an efficient correction in both PT, MT, and TL/L curves and restoration of TK in AIS surgery