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  • Poster presentation
  • Open Access

Geometric structure of spinal curves: application to adolescent idiopathic scoliosis

  • 1,
  • 1 and
  • 1, 2, 3
Scoliosis20138 (Suppl 1) :P12

  • Published:


  • Minimum Distance
  • Geometric Structure
  • Adolescent Idiopathic Scoliosis
  • Idiopathic Scoliosis
  • Adjacent Region


The spinal pattern of asymptomatic subjects is generally described using sagittal radiographic images. Frontal radiographic exposures allow clinical people to access to spinal deformations due to scoliosis. Biplanar radiographic examination, coupled with photogrammetric reconstructions, may be used for reconstructing the 3D spinal curve.


This communication presents a new study of the geometric structure of 3D spinal curves in adolescent idiopathic scoliosis.


The spine is considered as an heterogeneous beam, and is modeled as a deformable wire, along which vertebrae are beads rotating about the wire. Each vertebra can rotate about the 3D spinal curve. 3D spinal curves are compound of plane regions connected together by zones of transition. The 3D spinal curve is uniquely flexed along the plane regions. The angular offsets between adjacent regions are concentrated at the level of the middle zones of transition. The plane regions along the 3D spinal curve must satisfy two criteria: i) a criterion of minimum distance between the curve and the regional plane and ii) a criterion controlling that the curve is continuously plane at the level of the region.


The geometric structure of spinal curve is characterized by the sizes, and functions, of zones of transition. Spinal curves of asymptomatic subjects show three plane regions corresponding to spinal curves. In some scoliotic spines, four plane regions may be detected, and zones of transition may be lengthened, and not at the same place.

Authors’ Affiliations

Croix Rouge française CMCR Les Massues, Lyon, France
L’Hôpital Nord Ouest, France
Laboratoire de Physiologie de l’Exercice, Université de Lyon, Saint Etienne, France


  1. Berthonnaud E, H R, Dimnet J: Geometric structure of 3D spinal curves: plane regions and connecting zones. IRSN Orthopaedic,Google Scholar


© Deceuninck et al; licensee BioMed Central Ltd. 2013

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.