Alignment of centers of mass of body segments with the gravity line

Célia Amabile (1, 2) , Agathe Nerot (3, 2) , Julie Choisne (1, 2) , Hélène Pillet (1, 4, 2) , Virginie Lafage (5) , Wafa Skalli (1, 6, 4, 2)

1 LBM - Laboratoire de biomécanique
2 Institut de Biomecanique Humaine Georges Charpak
3 LBMC UMR T9406 - Laboratoire de Biomécanique et Mécanique des Chocs
4 Arts et Métiers ParisTech
5 Hospital for Special Surgery
6 I2M - Institut de Mécanique et d'Ingénierie de Bordeaux

Sagittal malalignment is associated with increased disability and can lead to postural troubles. The latter is often the result of an inadequate weight distribution on the spine and trigger compensatory mechanisms. No study to date has provided reference values for the alignment of centers of mass (CoM) of different body segments in asymptomatic subjects. The use of a bi-planar X-ray system (Dubousset et al. 2010) combined with 3D reconstruction of the external body shape (Nérot et al. 2015) allows for computation of the body segments’ CoM. The aim of this study was to provide baseline values for the position of each segment’s CoM compared to the gravity line (GL) in the sagittal plane.

Mots clés: postural alignment; center of masses; gravity line

Domaines: Sciences du Vivant [q-bio]

Célia Amabile, Agathe Nerot, Julie Choisne, Hélène Pillet, Virginie Lafage, et al.. Alignment of centers of mass of body segments with the gravity line. Computer Methods in Biomechanics and Biomedical Engineering, 2015, 18 (sup1), pp.1870-1871. ⟨10.1080/10255842.2015.1069547⟩. ⟨hal-02458530⟩