• Christopher P Ames, Justin S Smith, Ferran Pellisé, Michael Kelly, Jeffrey L Gum, Ahmet Alanay, Emre Acaroğlu, Pérez-Grueso Francisco Javier Sánchez FJS Spine Surgery Unit, Hospital Universitario La Paz, Paseo de la Castellana 261, 28046, Madrid, Spain., Frank S Kleinstück, Ibrahim Obeid, Alba Vila-Casademunt, Christopher I Shaffrey, Douglas C Burton, Virginie Lafage, Frank J Schwab, Shay Bess, Miquel Serra-Burriel, European Spine Study Group, and International Spine Study Group.
• Department of Neurosurgery, University of California San Francisco, 400 Parnassus Ave, San Francisco, CA, 94143, USA.
• Eur Spine J. 2019 Sep 1; 28 (9): 1998-2011.

PurposeHealth-related quality of life (HRQL) instruments are essential in value-driven health care, but patients often have more specific, personal priorities when seeking surgical care. The Scoliosis Research Society-22R (SRS-22R), an HRQL instrument for spinal deformity, provides summary scores spanning several health domains, but these may be difficult for patients to utilize in planning their specific care goals. Our objective was to create preoperative predictive models for responses to individual SRS-22R questions at 1 and 2 years after adult spinal deformity (ASD) surgery to facilitate precision surgical care.MethodsTwo prospective observational cohorts were queried for ASD patients with SRS-22R data at baseline and 1 and 2 years after surgery. In total, 150 covariates were used in training machine learning models, including demographics, surgical data and perioperative complications. Validation was accomplished via an 80%/20% data split for training and testing, respectively. Goodness of fit was measured using area under receiver operating characteristic (AUROC) curves.ResultsIn total, 561 patients met inclusion criteria. The AUROC ranged from 56.5 to 86.9%, reflecting successful fits for most questions. SRS-22R questions regarding pain, disability and social and labor function were the most accurately predicted. Models were less sensitive to questions regarding general satisfaction, depression/anxiety and appearance.ConclusionsTo the best of our knowledge, this is the first study to explicitly model the prediction of individual answers to the SRS-22R questionnaire at 1 and 2 years after deformity surgery. The ability to predict individual question responses may prove useful in preoperative counseling in the age of individualized medicine. These slides can be retrieved under Electronic Supplementary Material.

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