• Matthew K Tobin, Cristian Gragnaniello, Jack Horwitz, Felicia W Sun, Constantin Schizas, and Sergey Neckrysh.
• Department of Neurosurgery, University of Illinois at Chicago, Chicago, Illinois, USA. Electronic address: mktobin@iu.edu.
• World Neurosurg. 2021 Feb 1; 146: e902-e916.

ObjectiveEvaluation of lumbar canal dimensions in a Chicago population born in 2 different decades.MethodsThis is a retrospective chart review analyzing computed tomography reconstruction from patients born between 1940 and 1949 (older group) and 1970 and 1979 (younger group). The cross-sectional area (CSA) and anterior-posterior diameter (APD) of the lumbar bony canal was measured at each lumbar level at the level of the pedicle.ResultsOur study includes 918 patients, 372 in the young group and 546 in the older group. Older patients have significantly larger CSA and APD at all lumbar levels compared with younger patients. Further, CSA and APD comparisons between ethnicities demonstrate significant differences between individuals of Caucasian, Asian, Hispanic, African American, and Other ethnicities. Lastly, there were no differences in CSA or APD compared with factors known to affect bone health (smoking, steroid use, osteoporosis, cancer history).ConclusionsAs seen in European cohorts, our data suggest that patients born in the 1940s have both larger canal area and larger anterior-posterior diameter compared with the younger generation. These data suggest that significant differences exist between ethnicities. These differences highlight the importance of studying normal anatomical dimensions within different geographical populations and the importance of studying non-modifiable factors as they relate to spinal dimensions and spine patients. Furthermore, spinal canal growth seems to be negatively influenced in younger generations, a rather unexpected but worrying finding.Copyright © 2020 Elsevier Inc. All rights reserved.

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