title: 3D postural balance with regard to gravity line: an evaluation in the transversal plane on 93 patients and 23 asymptomatic volunteers.
abstract: Relevance of posture assessment has been reported in case of spine disorders. This study explores the interest in quantifying posture using 3D reconstruction from biplanar X-rays in free standing position and a force plate. 93 patients consulting for spine disorders were divided ('3D deformity', 'sagittal imbalance' and 'mild deformity') and compared with 23 asymptomatic volunteers. Registration of the gravity line (GL) in reconstruction yielded transversal position of the center of acoustic meati (CAM) T1, T4, T9, L3, S1 and hip axis (HA) with regard to GL. Transversal position of CAM and L3 appeared as relevant parameters to discriminate patients from volunteers. Sagittal inclination of the axis linking the CAM to HA was correlated with position of the CAM to GL (r = 0.92 for patients). In conclusion, observing posture in 3D with regard to GL provides clinical relevant information. CAM-HA inclination may improve postural evaluation without force plate.
authors.affiliation: Laboratoire de Biomecanique Arts et Metiers ParisTech CNRS, 151 Boulevard de l'Hopital, 75013, Paris, France. jean-sebastien@gmx.de
authors.forename: Jean-Sebastien
authors.initials: JS
authors.lastname: Steffen
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Obeid
authors.forename: Nicolas
authors.initials: N
authors.lastname: Aurouer
authors.forename: Olivier
authors.initials: O
authors.lastname: Hauger
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Vital
authors.forename: Jean
authors.initials: J
authors.lastname: Dubousset
authors.forename: Wafa
authors.initials: W
authors.lastname: Skalli
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D005260:Female; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D008953:Models, Anatomic; D004856:Postural Balance / Q000502:physiology*; D011859:Radiography; D012016:Reference Values; D012600:Scoliosis / Q000000981:diagnostic imaging*; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging*