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Is elevated body mass index protective against cervical spine injury in adults?

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Abstract

Purpose

Correlate body mass index (BMI) with incidence and type of cervical spine injury seen on CT in adult patients presenting with blunt trauma.

Materials and methods

Retrospective chart review of all adult blunt trauma patients who had a cervical spine CT performed at our level 1 trauma center during an approximately 3-year period.

Results

A statistically significant (p = 0.01) difference in cervical spine injury incidence was present between different BMI groups. Cervical spine injury incidence was 7.7% for underweight (BMI ≤ 18) patients, 7.1% for normal weight (BMI 18–25) patients, 6.2% for overweight/obese (BMI 25–35) patients, and 4.7% for morbidly obese (BMI > 35) patients. Using BMI > 18–25 as a reference group, females with BMI > 25–35 had an adjusted odds ratio (aOR) of 0.56 (CI 0.41–0.75) and females with BMI > 35 had an aOR of 0.42 (CI 0.26–0.70). Males with a BMI ≤ 18 had an aOR of 2.20 (CI 1.12–4.32) and males with BMI > 35 had an aOR of 0.66 (CI 0.46–0.95). A particularly low incidence of cervical spine injury was observed in patients older than 65 in the obese group with a cervical spine injury rate of only 1.4% in this patient population. No statistical significant difference was seen in injury morphology across the BMI groups.

Conclusion

An inverse relationship exists between BMI and the overall incidence of cervical spine injury. This protective effect appears to be influenced by gender with elevated BMI having lower relative odds of cervical spine injury in women than in men. A particularly low rate of cervical spine injury was identified in obese patients over the age of 65. Routine imaging of all elderly, obese trauma patients with low energy mechanism of injury may not be warranted.

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Acknowledgments

1. Memorial Hospital System in Houston.

2. We acknowledge the support provided by the Biostatistics/Epidemiology/Research Design (BERD) component of the Center for Clinical and Translational Sciences (CCTS) for this project. CCTS is mainly funded by a grant (UL1 TR000371) from the National Center for Advancing Translational Sciences (NCATS), awarded to University of Texas Health Science Center at Houston. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NCATS.

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Authors and Affiliations

  1. Department of Diagnostic and Interventional Imaging, McGovern Medical School, The University of Texas Health Science Center at Houston, 6431 Fannin Street, 2.130B, Houston, TX, 77030, USA

    Nicholas M. Beckmann, Susanna C. Spence & O. Clark West

  2. Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX, USA

    Chunyan Cai

  3. Biostatistics/Epidemiology/Research/Design Core, Center for Clinical and Translational Sciences, The University of Texas Health Science Center at Houston, 6410 Fannin, UTPB 1100.08, Houston, TX, 77030, USA

    Chunyan Cai

  4. Department of Orthopedic Surgery, McGovern Medical School, The University of Texas Health Science Center at Houston, 6431 Fannin Street, Houston, TX, 77030, USA

    Mark L. Prasarn

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  1. Nicholas M. Beckmann
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Correspondence to Nicholas M. Beckmann.

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Beckmann, N.M., Cai, C., Spence, S.C. et al. Is elevated body mass index protective against cervical spine injury in adults?. Emerg Radiol 25, 415–424 (2018). https://doi.org/10.1007/s10140-018-1602-2

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  • DOI: https://doi.org/10.1007/s10140-018-1602-2

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