European Spine Journal

, Volume 16, Issue 4, pp 531–536 | Cite as

Relation between the sagittal pelvic and lumbar spine geometries following surgical correction of adolescent idiopathic scoliosis

  • Frédéric Tanguay
  • Jean-Marc Mac-Thiong
  • Jacques A. de Guise
  • Hubert Labelle
Original Article


Sagittal spinopelvic relations have been reported in adolescent idiopathic scoliosis (AIS), but there is little information on their effect following surgery. The objective of this study is to evaluate the relation between the pelvic and lumbar spine geometries following posterior spinal instrumentation and fusion (PSIF). Sixty patients with AIS undergoing PSIF were studied retrospectively. Thoracic kyphosis (TK), lumbar lordosis (LL), LL within and below fusion, pelvic incidence (PI), sacral slope (SS) and pelvic tilt (PT) were measured on preoperative and postoperative standing lateral radiographs. Significant postoperative correlations were found between PI and LL (= 0.67), SS and LL (= 0.90), PI and LL below fusion (= 0.40), SS and LL below fusion (= 0.48). Pelvic parameters did not influence LL within fusion. A strong correlation was found between LL below and within fusion (= −0.76). The close interdependence between lumbar lordosis and pelvic geometry preoperatively is maintained postoperatively following PSIF. In the planning of surgery for AIS, it may be helpful to evaluate the sagittal pelvic morphology (PI) in addition to the spinal curves. Preoperative evaluation of the pelvic morphology could be used to optimize intraoperative positioning of the patient and to determine the optimal amount of LL that needs to be restored or preserved by the instrumentation, so that LL remains congruent with the pelvic morphology.


Adolescent idiopathic scoliosis Lumbar lordosis Pelvic morphology Sagittal alignment Spinal instrumentation 



This research was funded by Canada’s Research-Based Pharmaceutical Companies (Rx&D), by the Fonds de Recherche en Santé du Québec and by the Strategic Training Grants Program (MENTOR program) of the Canadian Institutes of Health Research.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Frédéric Tanguay
    • 1
    • 2
    • 3
  • Jean-Marc Mac-Thiong
    • 1
    • 2
  • Jacques A. de Guise
    • 3
    • 4
  • Hubert Labelle
    • 1
    • 2
  1. 1.Faculty of MedicineUniversity of MontrealMontrealCanada
  2. 2.Division of Orthopaedic SurgeryCHU Sainte-JustineMontrealCanada
  3. 3.Laboratoire d’Imagerie en Orthopédie, Research Center, CHUMUniversity of MontrealMontrealCanada
  4. 4.Department of Automated Production EngineeringÉcole de Technologie SupérieureMontrealCanada

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