• Eric O Klineberg, Joseph B Wick, Renaud Lafage, Virginie Lafage, Ferran Pellise, Sleiman Haddad, Caglar Yilgor, Susana Núñez-Pereira, Munish Gupta, Justin S Smith, Christopher Shaffrey, Frank Schwab, Christopher Ames, Shay Bess, Stephen Lewis, Lawrence G Lenke, Sigurd Berven, and International Spine Study Group.
• Department of Orthopedic Surgery, University of California Davis, Sacramento, CA.
• Spine. 2021 Feb 15; 46 (4): E267-E273.

Study DesignProspective analysis of example cases.ObjectiveThe aim of this study was to analyze the accuracy and repeatability of a new comprehensive classification system for capturing complications data in adult spinal deformity.Summary Of Background DataComplications are common in adult spinal deformity surgery. However, no consensus exists on the definition or classification of complications in adult spinal deformity surgery. The lack of consensus significantly limits understanding of complications' effects on outcomes in surgery for adult spinal deformity.MethodsUsing a Delphi method, members of the International Spine Study Group, AO Spine, and the European Spine Study Group collaborated to develop an adult spinal deformity classification system. The multidomain classification system accounts for medical complications (cancer, cardiopulmonary, central nervous system, gastrointestinal, infectious, musculoskeletal, renal) and surgical complications (implant complications, radiographic complications, neurologic events, intraoperative events, and wound complications). Seventeen individuals ("event readers"), including spine surgeons, trainees, and research coordinators, used the new classification system two separate times to analyze complications in ten example cases. The accuracy and repeatability of the classification system were subsequently calculated based on the providers' responses for the example cases.ResultsThe 10 example cases included 22 complications. Nearly 95% of complications were captured by >95% of the event readers. The system demonstrated good repeatability of 86.9% between the first and second set of responses provided by event readers.ConclusionThe ISSG-AO Multi-Domain Spinal Deformity Complication Classification System for Adult Spinal Deformity demonstrated good accuracy and repeatability among both surgeons and research coordinators in capturing complications in adult spinal deformity surgery. The ISSG-AO system may be applied to help better understand the impact of complications on outcomes and costs in adult spinal deformity surgery.Level of Evidence: 5.Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.

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