Using EOS Imaging Technique to Provide Reference Values for Proximal, Distal, and Total Thoracic Kyphosis in the Iranian Population

Background & Objectives: EOS, as a new‎ imaging technique, has several benefits over conventional radiography in measuring spinal curvatures. In this study, we aimed to use EOS to determine the normal values of thoracic kyphosis besides its association with the participants' age and gender. Materials & Methods: In this retrospective cross-sectional study, ۱۰۰ individuals with no history of spinal abnormality were included. Spinal curvatures, comprising proximal thoracic segment, distal thoracic segment, and total thoracic kyphosis, were measured on EOS images using a Cob method. The demographic characteristics of the participants, such as age and gender were also extracted from medical profiles. Results: The study population included ۳۱ males and ۶۹ females with a mean age of ۲۷.۲ ± ۱۷.۴ years (range ۶-۶۶). The mean curvatures of proximal and distal thoracic segments were ۱۴.۵ ± ۶.۵º and ۳۲.۷ ± ۷.۵º, respectively. The mean total thoracic kyphosis was ۴۷.۲ ± ۷.۲º. Besides, distal and total thoracic kyphosis, but not proximal thoracic segment, were significantly more in participants aged over ۴۰ years (p=۰.۰۳, p=۰.۰۴, and p=۰.۰۷, respectively). No significant association was found between the thoracic curvatures and participants' sex. Conclusion: It seems that there is a direct relationship between distal and total thoracic kyphosis and aging; however, more studies are required in order to approve our results.

Keywords:

Spinal curvature , thoracic kyphosis , EOS