Use of iliac screw associated with more correction of lumbar lordosis than S2-alar-iliac screw for adult spinal deformity

Abstract Background To date, there is a paucity of reports clarifying the change spinopelvic parameters in patients with adult spinal deformity (ASD) who underwent long segment fusion using iliac screw (IS) and S2-alar-iliac (S2AI) fixation. Methods A retrospective review consecutive correction surgery for ASD between 2013 2017 was performed. Patients were divided into two groups based on whether IS or S2AI fixation All radiographic measured preoperatively, immediately postoperatively, last follow-up. Demographics, intraoperative clinical data analyzed groups. Additionally, cohort subdivided according to postoperative pelvic incidence (PI): subgroup (C) defined as PI ≥5° (NC) < 5°. In analyses, 2 different types directly compared. Results total 142 met inclusion criteria: 111 received 31 The group (65.6 ± 26°, 39.8 13.8°) showed significantly higher lumbar lordosis (LL) upper (ULL) than (54.4 17.9°, 30.3 9.9°) ( p 0.05). (C), increased from 53° preoperatively 59° postoperatively at least 50% cohort, mean 5.8° outcomes follow-up better terms VAS scores back leg. occurrence sacroiliac joint pain fracture greater (25.8% vs 9%, 0.05) (16.1% 3.6%, Conclusions Compared technique, technique usable larger cantilever force demonstrated more lordosis, possible increase incidence. Further study warranted clarify impaction these results.