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The Link Between the 3D Spino-pelvic Alignment and Vertebral Body morphology in Adolescent Idiopathic Scoliosis

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Abstract

Background

Vertebral anterior overgrowth has been suggested as part of the etio-pathogenesis of adolescent idiopathic scoliosis (AIS). However, the link between 3D spinopelvic alignment and the vertebral anteroposterior height asymmetry in different scoliotic curves types and whether it deviates from the non-scoliotic controls, has not been studied.

Purpose

We aimed to retrospectively describe the link between the anteroposterior vertebral height differences (ΔAPVH) measured in the true sagittal plane of each vertebra and the spinopelvic parameters in three anatomical planes.

Methods

30 AIS cases with primary thoracic curves, 28 with thoracolumbar/lumbar curves, and 20 non-scoliotic controls were included. All subjects had 3D reconstruction of the spine, generated from low-dose upright stereoradiography images. Pelvic incidence (PI), thoracic and lumbar coronal and sagittal curve measurements, and vertebral axial rotation were measured. The association between the spinopelvic parameters and ΔAPVH were compared between the two AIS and control groups.

Results

ΔAPVH at the apex of the curve was significantly different between the two AIS groups, as well as between both AIS groups and the controls and was related to the vertebral apical rotation (p < 0.05). Kyphosis and lordosis measurements were significantly related to the sum of the ΔAPVH in thoracic and lumbar regions respectively in AIS group but not in non-scoliotic controls (p < 0.05).

Conclusions

The ΔAPVH depended on the scoliotic curve type and was significantly different from the controls only at the apical levels. Morphological changes in the scoliotic vertebrae, measured as anterior-posterior differences in the vertebral height, are related to the sagittal spinal profile suggesting the morphology of the vertebra contributes to the sagittal curvatures of the spine in AIS; nonetheless, such relationship between the vertebral morphology and the sagittal profile was not evident in non-scoliotic controls.

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Authors and Affiliations

  1. Division of Orthopaedic Surgery, The Children’s Hospital of Philadelphia, 34th Street and Civic Center Boulevard, Philadelphia, PA, 19104-4399, USA

    Saba Pasha PhD & Woudbhav N. Sankar MD

  2. Department of Orthopaedic Surgery, University Medical Center Utrecht, P.O. Box 85500, Utrecht, GA, 3508, The Netherlands

    Rene M. Castelein MD, PhD

Authors
  1. Saba Pasha PhD
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  2. Woudbhav N. Sankar MD
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  3. Rene M. Castelein MD, PhD
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Correspondence to Saba Pasha PhD.

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Conflicts of Interest and Source of Funding: The authors report no conflicts of interest relevant to this submission. This study received no funding and was approved by the Institutional Review Board.

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Pasha, S., Sankar, W.N. & Castelein, R.M. The Link Between the 3D Spino-pelvic Alignment and Vertebral Body morphology in Adolescent Idiopathic Scoliosis. Spine Deform 7, 53–59 (2019). https://doi.org/10.1016/j.jspd.2018.05.016

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  • DOI: https://doi.org/10.1016/j.jspd.2018.05.016

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