• Basel Sheikh Alshabab, Renaud Lafage, Justin S Smith, Han Jo Kim, Gregory Mundis, Eric Klineberg, Christopher Shaffrey, Alan Daniels, Christopher Ames, Munish Gupta, Douglas Burton, Richard Hostin, Shay Bess, Frank Schwab, Virginie Lafage, and International Spine Study Group ISSG.
• Department of Orthopedic Surgery, Northwell Health, Lenox Hill Hospital, New York, NY.
• Spine. 2022 Jul 1; 47 (13): 922930922-930.

Study DesignRetrospective cohort study.ObjectiveThe aim of this study was to investigate the evolution of proximal junctional kyphosis (PJK) rate over 10-year enrollment period within a prospective database.Summary Of Background DataPJK is a common complication following adult spinal deformity (ASD) surgery and has been intensively studied over the last decade.MethodsPatients with instrumentation extended to the pelvis and minimum 2-year follow-up were included. To investigate evolution of PJK/proximal junctional failure (PJF) rate, a moving average of 321 patients was calculated across the enrollment period. Logistic regression was used to investigate the association between the date of surgery (DOS) and PJK and/or PJF. Comparison of PJK/PJF rates, demographics, and surgical strategies was performed between the first and second half of the cohort.ResultsA total of 641 patients met inclusion criteria (age: 64±10 years, 78.2% female, body mass index: 28.3±5.7). The overall rate of radiographic PJK at 2 years was 47.9%; 12.9% of the patients developed PJF, with 31.3% being revised within 2-year follow-up. Stratification by DOS produced two halves. Between these two periods, rate of PJK and PJF demonstrated nonsignificant decrease (50.3%-45.5%, P =0.22) and (15.0%-10.9%, P =0.12), respectively. Linear interpolation suggested a decrease of 1.2% PJK per year and 1.0% for PJF. Patients enrolled later in the study were older and more likely to be classified as pure sagittal deformity ( P <0.001). There was a significant reduction in the use of three-column osteotomies ( P <0.001), an increase in anterior longitudinal ligament release ( P <0.001), and an increase in the use of PJK prophylaxis (31.3% vs 55.1%). Logistical regression demonstrated no significant association between DOS and radiographic PJK ( P =0.19) or PJF ( P =0.39).ConclusionDespite extensive research examining risk factors for PJK/PJF and increasing utilization of intraoperative PJK prophylaxis techniques, the rate of radiographic PJK and/or PJF did not significantly decrease across the 10-year enrollment period of this ASD database.Copyright © 2022 Wolters Kluwer Health, Inc. All rights reserved.

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