CLINICAL AND RADIOLOGICAL OUTCOMES OF THE NEUROMUSCULAR SCOLIOSIS TREATMENT WITH S2-ALAR-ILIAC SCREW BY INTRAOPERATIVE NAVIGATION

ABSTRACT Objective: Analyze the clinical and radiological aspects of the S2AI screw technique in patients with neuromuscular scoliosis undergoing deformity correction surgery by intraoperative navigation. Methods: Retrospective analysis of medical records of patients undergoing neuromuscular scoliosis correction surgery with the S2-alar-iliac technique between 2017-2020. Results: In the total sample of 35 patients, 18 (51.4%) were female, with an average age of 14.9. The average preoperative coronal curve was 100° ± 26.2, with an average correction of 55% ± 16.3, with an average coronal curve of 44.8°± 19.5 at the end of surgery and 45 ° ± 19.6 at the end of follow-up. The average preoperative pelvic obliquity was 27.9°± 10.9, with a correction rate of 66.1% ± 27.6, being 8.2° ± 5.4 at the end of surgery and 9 .4°± 7.0 at the end of the follow-up. The average of operated levels was 17.3± 0.7. All 70 S2 screws had a diameter of 7mm. The average duration of surgeries was 416 ± 86 minutes, with estimated intraoperative bleeding of 921 ± 394.1 ml. The average density of screws in the sample was 1.3 ± 0.2 screws per level, and the average density in the lumbosacral spine was 1.5 ± 0.2. Conclusions: Intraoperative navigation can contribute to the rate of complications related to the S2AI screw decrease; in addition, the length of this screw appears to have significant relevance in maintaining the correction throughout the follow-up. Level of evidence IV; Case series. Resumen: Objetivo: Analizar los aspectos clínicos y radiológicos de la técnica del tornillo S2AI en pacientes con escoliosis neuromuscular sometidos a cirugía de corrección de deformidades con ayuda de navegación intraoperatoria. Métodos: Análisis retrospectivo de historias clínicas de pacientes sometidos a cirugía de corrección de escoliosis neuromuscular con la técnica S2-alar-ilíaca entre 2017-2020. Resultados: De la muestra de 35 pacientes, 18 (51,4%) eran mujeres, con una edad media de 14,9 años. La curva coronal media preoperatoria fue 100° ± 26,2, con una corrección media del 55% ± 16,3, con una curva coronal media de 44,8° ± 19,5 al final de la cirugía y de 45° ± 19,6 al final del seguimiento. La oblicuidad pélvica preoperatoria media fue de 27,9° ± 10,9, con una tasa de corrección del 66,1% ± 27,6, siendo de 8,2° ± 5,4 al final de la cirugía y de 9,4°± 7,0 al final del seguimiento. El promedio de los niveles operados fue de 17,3± 0,7. Los 70 tornillos S2 tenían un diámetro de 7 mm. La durac