Revisiting thoracic kyphosis: a normative description of the thoracic sagittal curve in an asymptomatic population
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ORIGINAL ARTICLE
Revisiting thoracic kyphosis: a normative description of the thoracic sagittal curve in an asymptomatic population Amer Sebaaly1,2 · Clément Silvestre3 · Maroun Rizkallah1 · Pierre Grobost3 · Thomas Chevillotte3 · Khalil Kharrat1,2 · Pierre Roussouly3 Received: 12 May 2020 / Accepted: 15 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose Thoracic kyphosis (TK) remained in the shadow of lumbar lordosis. Based on Berthonnaud and Roussouly segmentation, TK is divided into two arches: upper TK (UTK) and lower TK (LTK). The purpose of this study is to propose a normative description of the TK arches in an asymptomatic adults’ population and their correlation with spinal and pelvic parameters. Methods This is an observational study performed on asymptomatic healthy Caucasians volunteers aged between 18 and 45 years. Each patient had a standardized standing biplanar full spine X-rays. Using K EOPS®, sacropelvic parameters and global spinal parameters (LL, TK) as well as the inflexion point location were measured. The upper lumbar lordosis angle (ULL) as well as LTK and UTK was calculated. Patients were classified according to Roussouly morphotypes of normal spine. Results A total of 373 adults (F/M = 1.4/1) were enrolled with mean age of 27 years. Mean UTK averaged 25.8°, while mean LTK averaged 19.8° (p 0.05), while LTK values were variable among different Roussouly spine subtypes (p 0.5, moderate if 0.3 ≤ R ≤ 0.5 and small if R
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