Friday, September 28, 2018 10:30 AM–12:00 PM abstracts: deformity: technical factors: 169. Minimally invasive versus standard surgery in idiopathic scoliosis patients: a comparative study

BACKGROUND CONTEXT Minimally invasive scoliosis surgery (MISS), in smaller studies, has been shown to have significant benefits over standard posterior spinal fusion (PSF) in adolescent idiopathic scoliosis (AIS). PURPOSE This study seeks to compare the two procedures in a large group of patients. STUDY DESIGN/SETTING Multicenter Ambispective. PATIENT SAMPLE A total of 303 patients. OUTCOME MEASURES Blood loss, surgical time, complication rates, transfusion rate. METHODS Retrospective review of a multiinstitutional prospective database was performed. Radiographic, clinical, and operative data were collected for MISS patients (3/08–7/17) and PSF (1/13 to 7/17). RESULTS A total of 303 patients met the inclusion criteria: 150 were MISS and 153 were PSF. There were no significant differences in preoperative Cobb angle (MISS: 55.0° vs. PSF: 54.1°, p=0.798) or kyphosis (25° vs. 26°, p=0.342). MISS patients were significantly older (15.3 vs. 14.7, p CONCLUSIONS This is the largest study comparing the surgical outcomes of MISS and PSF. Minimally invasive scoliosis surgery patients seem to benefit from less blood loss, lower transfusion risk and shorter hospital stay with similar Cobb correction.