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Dominic Maggio, Tamir T. Ailon, Justin S. Smith, Christopher I. Shaffrey, Virginie Lafage, Frank Schwab, Regis W. Haid Jr., Themistocles Protopsaltis, Eric Klineberg, Justin K. Scheer, Shay Bess, Paul M. Arnold, Jens Chapman, Michael G. Fehlings, Christopher Ames, AOSpine North America and International Spine Study Group

(HRQOL) scores. 29 Based on normative spinopelvic parameter data, corrective surgery should target a sagittal vertical axis (SVA) < 50 mm and a PT < 20°. Furthermore, good postoperative HRQOL scores are correlated with a lumbar lordosis that is within approximately 10° of the pelvic incidence. 43 Postoperative positive SVA and coronal imbalance are major risk factors for the development of adjacent segment pathology (ASP) after lumbar or lumbosacral fusion. 9 , 11 , 21 , 26 , 30 , 37 , 41 , 46 “Adjacent segment pathology” is a general term that refers to any