RT Journal Article SR Electronic T1 Postoperative Sagittal Spinal Alignment Changes Following Corrective Surgery in Adult Spinal Deformity JF International Journal of Spine Surgery JO Int J Spine Surg FD International Society for the Advancement of Spine Surgery SP 1082 OP 1089 DO 10.14444/8194 VO 15 IS 6 A1 Albayar, Ahmed A1 Ramayya, Ashwin A1 Sullivan, Patricia Zadnik A1 Yoon, Jang A1 Saifi, Comron A1 Roche, Abigail A1 Ali, Zarina S. A1 Welch, William C. A1 Arlet, Vincent A1 Ozturk, Ali K. YR 2021 UL https://www.ijssurgery.com/content/15/6/1082.abstract AB Background There is a paucity of literature covering the spinal alignment changes following adult spinal deformities (ASD) corrective surgeries. In theory, patients’ posture and overall alignment may vary with postoperative pain, bracing, and other external variables requiring further radiographic follow-up. The purpose of the study is to investigate changes in sagittal alignment in the first 3 months postoperatively.Methods This is a retrospective case series of ASD patients who underwent deformity surgeries from October 2015 to June 2018. Patients < 40 years old, had < 6 levels fused, had acute proximal junctional kyphosis (PJK) or failure, or lacked imaging were excluded. Physiologic measures, spine alignment changes measured in whole-spine radiographs. Lumbar lordosis (LL), thoracic kyphosis (TK), and sagittal vertical axis (SVA) at immediate and 3-month postoperative time points were measured, then compared via 2-sample Student t tests. Furthermore, TK after upper thoracic to pelvis (UT-P) fusions was compared with lower thoracic to pelvis (LT-P) fusions via paired t test.Results Thirty-six patients (24 females, 67%) with a mean age of 61.5 years (range, 40–75 years) were included. Spinal alignment comparisons showed a significant increase in TK at the 3-month time point (P = 0.006). Additionally, wide variations in SVA (range, 47–144 mm) were noted, yet not statistically significant, likely due to the changes being in both positive and negative directions (P = 0.18). No significant difference was found when TK was compared in the UT-P vs LT-P groups.Conclusions Our results suggest that as postoperative pain subsides and the body settles into its new alignment, significant changes occur in spine sagittal parameters in the subacute period following surgery.Level of Evidence 4.