• Solène Prost, Yann-Philippe Charles, Brice Ilharreborde, Guillaume Riouallon, Sébastien Pesenti, Benjamin Blondel, and French Spine Surgery Society (SFCR).
• AIx-Marseille University, APHM, CNRS, ISM, CHU Timone, Spine surgery, Marseille, France.
• Spine. 2023 Dec 15; 48 (24): 172617321726-1732.

Study DesignRetrospective study of a multicenter prospective database.ObjectiveThe objective of this study was to determine the organization and correlations between different spinal segments according to pelvic incidence (PI) and age.Summary Of Background DataWhen planning surgery for the correction of adult spinal deformities, considering lumbar lordosis (LL) as a uniform segment is an approximation that can lead to planning errors.Materials And MethodsRadiographs of 1540 subjects were analyzed and divided into three PI groups: low <45, intermediate 45 to 60, high >60, and stratified by age (<45, 45-70, and >70 yr). The different segments of L1-L4 proximal lumbar lordosis (PLL), L4-S1 distal lumbar lordosis (DLL), and T10-L1 thoracolumbar junction (TLJ) were analyzed.ResultsThe mean age was 53.5 years (SD=17, minimum=20, maximum=93). There was a significant correlation between thoracic kyphosis T5-T12 and TLJ segment T10-L1 ( r =0.581, P <0.001). Only the L1-L4 PLL segment correlated with PI ( r =0.47, P <0.001). The T10-L1 TLJ segment was constant regardless of age or PI groups considered (mean=-8, SD=9). PLL did not vary with aging but differed according to PI. The DLL showed significant differences between age and PI groups but without a significant correlation between PI and DLL.ConclusionsPelvic morphology is known to determine the curvatures of the spine, however, the distribution of LL is not homogeneous. Our study provided a normative value reference and showed that T10-L1 is constant regardless of age or PI.Level Of EvidenceIII.Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.

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