The torg ratio of C3–C7 in African Americans and European Americans: A skeletal study

David Ezra, Viviane Slon, Einat Kedar, Youssef Masharawi, Khalil Salame, Deborah Alperovitch-Najenson, Israel Hershkovitz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The ratio between the sagittal diameter of the spinal canal and the sagittal diameter of the vertebral body, known as the “Torg ratio”, is often used to test for spinal canal narrowing. Here, we investigate this ratio in a large population, consisting of two ethnicities, both sexes and three age groups. Measurements were taken on the dry cervical verterbrae (C3–C7) of 277 individuals using a digital apparatus allowing for the recording of 3D coordinates of a set of landmarks on the vertebral body. Vertebral body and vertebral foramen lengths were compared across the different subgroups. Vertebral body and vertebral foramen lengths differ significantly between males and females and between African Americans and European Americans. With age, the vertebral body length increases while the foramen length does not undergo significant changes. These anatomical differences are reflected in differences in the Torg ratio calculated for the different subgroups. In conclusion, our findings suggest that a hard cutoff on the Torg ratio used to define a pathological narrowing of the cervical spine should be adapted to the population the patients come from. Clin. Anat. 32: 84-89, 2019.

Original languageEnglish
Pages (from-to)84-89
Number of pages6
JournalClinical Anatomy
Volume32
Issue number1
DOIs
StatePublished - Jan 2019

Funding

FundersFunder number
Israel Science Foundation1397/08

    Keywords

    • Torg–Pavlov ratio
    • cervical spine
    • spinal stenosis
    • vertebral body
    • vertebral foramen

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