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Study Design: Retrospective comparative study., Objectives: This study compares supine vs bending flexibility radiographs and evaluates their ability to predict residual postoperative lumbar curvature after selective thoracic fusion for Lenke 1 and 2 curves across different lumbar modifiers (A, B, and C) in adolescent idiopathic scoliosis (AIS)., Methods: This was a retrospective review of AIS Lenke 1 and 2 patients who underwent posterior fusion. All patients had preoperative flexibility radiographs including side-bending and supine posteroanterior (PA) films, in addition to pre- and post-operative standing PA and lateral radiographs. We used SurgiMap 2.0 software for all radiographic measurements. Pearson correlations and linear regression models were developed in SAS., Results: A total of 86 patients were included mean age 14.9 years and follow-up 72.3 months . Preoperative supine lumbar Cobb angle and preoperative side-bending Cobb angles had similar, positive correlations with postoperative lumbar Cobb angle, r = .55 ( P < .001) and r = .54 ( P < .001), respectively. Three regression models were built to predict postoperative lumbar Cobb angles from preoperative information: Model S (R 2 = .39) uses preoperative supine lumbar curve; Model B (R 2 = .44) uses preoperative side-bending lumbar curve; Model SB (R 2 = .49) uses both preoperative supine and side-bending lumbar curves. Model S and B performed just as well as Model SB., Conclusion: Either supine or side-bending radiographs alone may be used to estimate mean residual postoperative lumbar curvature after selective posterior thoracic fusion, but little is to be gained by taking both supine and side-bending radiographs., Competing Interests: Declaration of Conflicting InterestsThe author(s) declared the following potential conflicts of interest with respect to the research, authorship, and/or publication of this article: PVR serves as a committee member of the North American Spine Society. RS reports no disclosures or conflicts of interest. TFR or an immediate family member is a member of a speakers’ bureau or has made paid presentations on behalf of Stryker; serves as an unpaid consultant to Apto Orthopaedics/Austin Bioinnovation Institute of Akron; serves as a paid consultant to Medtronic; has stock or stock options held in Apto Orthopaedics; serves as a board member, owner, officer, or committee member of AAOS, Foundation for the Advancement of Pediatric Orthopedics, and Pediatric Orthopaedic Society of North America; and on the Editorial or governing board of Journal of Bone and Joint Surgery-American and Journal of Pediatric Orthopedics. TM reports no disclosures or conflicts of interest. LVF or an immediate family member is an employee of Xellia pharmaceuticals; serves as a board member, owner, officer, or committee member of Pediatric Orthopaedic Society of North America; Pediatric Deputy Editor of European Journal of Orthopaedic Surgery and Traumatology