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European Spine Journal

, Volume 27, Issue 9, pp 2192–2202 | Cite as

Sagittal classification in adolescent idiopathic scoliosis: original description and therapeutic implications

  • K. Abelin-Genevois
  • D. Sassi
  • S. Verdun
  • P. Roussouly
Original Article

Abstract

Introduction

Surgical treatment of AIS aims to correct the coronal and sagittal alignment of the spine. The global alignment of the spine may be normalized through reciprocal changes between the fused spine and adjacent segments. We propose a new classification system describing the specific sagittal patterns induced by AIS to define reproducible guidelines for the surgical strategy.

Methods

We analyzed 100 consecutive AIS patients aged between 12 and 18 years candidate for spinal fusion. The following parameters were measured and compared for each pattern: spino-pelvic parameters, magnitude and length of the lumbar sagittal angle, magnitude and length of the thoracic sagittal angles (T1T12 and T4T12 angles, TKmax), T10 L2 angle, C7 slope and C2C7 angle.

Results

Three parameters strongly differentiated the four patterns: thoracic sagittal angles (T1T12 and T4T12 angles, TKmax), T10 L2 angle and C7 slope. Less than half of the patients (44%) had a normal sagittal shape. Within, Type 2 characterized by thoracic hypokyphosis, Type 2a (thoracic hypokyphosis) were mostly Lenke type 1 or 2 curves, and type 2b (thoracic hypokyphosis with TL kyphosis) occurred specifically in double major or TL/L curves. Type 3 were two-curve sagittal shape with cervicothoracic kyphosis and TL lordosis (9%), mainly in Lenke 1 curves.

Discussion

This new classification summarizes all the pathological scenarios of the sagittal alignment of AIS into four patterns. A specific surgical planning can be extrapolated for each pattern. In type 1, the objective is to preserve the sagittal shape. In type 2, the objective is to restore thoracic kyphosis. In type 2b, TL junction should be straightened. In type 3, the objective is to reshape the lower arc of thoracic sagittal angle and straighten the TL junction.

Graphical abstract

These slides can be retrieved under Electronic Supplementary Material.

Keywords

Adolescent idiopathic scoliosis Classification Sagittal alignment Hypokyphosis Treatment guidelines 

Notes

Compliance with ethical standards

Conflict of interest

K. Abelin-Genevois, S. Verdun and D. Sassi have no conflict of interest to disclose. P. Roussouly is shareholder of SMAIO, France. He is also a consultant for Kisco Systems and receives royalties from Medtronic, but these disclosures are not related to the present work.

Supplementary material

586_2018_5613_MOESM1_ESM.pptx (617 kb)
Supplementary material 1 (PPTX 617 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Spine Surgery, Centre Medico Chirurgical et de Réadaptation des MassuesCroix Rouge FrancaiseLyon Cedex 05France
  2. 2.Departement of Medical Research, Groupement des Hôpitaux de l’Institut Catholique de LilleHôpital Saint PhilibertLomme CedexFrance

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