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In vivo three-dimensional segmental analysis of adolescent idiopathic scoliosis

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Abstract

Introduction

An accurate assessment of three-dimensional (3D) intervertebral deviation is crucial to the better surgical correction of adolescent idiopathic scoliosis (AIS). However, a precise 3D study of intervertebral deviation has not been previously reported.

Objective

The purpose of the present study is to evaluate the intervertebral coronal inclination, axial rotation and sagittal angulation of AIS using 3D bone models and a local coordinate system.

Materials and methods

3D bone models of the thoracic and lumbar spine of ten AIS patients were constructed using computed tomography. The local coordinate axis was determined semi-automatically for each vertebra. By using these local coordinates, the intervertebral deviation angles were calculated in the coronal, axial and sagittal planes and projected to subjacent local coordinates.

Result

The intervertebral deformity in the coronal plane was larger near the apical region and smaller near the junctional region. Conversely, the intervertebral rotation in the axial plane was smaller near the apical region, and larger near the junctional region. Concerning the sagittal plane deformity, the constant tendency was not recognized.

Conclusion

Using a local coordinate system for the vertebra of AIS, we measured the 3D intervertebral coronal, axial and sagittal deviation of the thoracolumbar spine and found that the change in the intervertebral inclination angle in the coronal plane increased toward the apical region and decreased toward the junctional region, and that the converse tendency was noted for the axial intervertebral rotational angle. This analysis provides an improved 3D guide for the surgical correction of AIS.

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Authors and Affiliations

  1. Division of Orthopaedic Biomaterial Science, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan

    Takako Hattori, Yukitaka Nagamoto & Kazuomi Sugamoto

  2. Department of Orthopaedics, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan

    Hironobu Sakaura, Motoki Iwasaki & Hideki Yoshikawa

Authors
  1. Takako Hattori
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  2. Hironobu Sakaura
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  3. Motoki Iwasaki
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  4. Yukitaka Nagamoto
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  5. Hideki Yoshikawa
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  6. Kazuomi Sugamoto
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Correspondence to Takako Hattori.

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Hattori, T., Sakaura, H., Iwasaki, M. et al. In vivo three-dimensional segmental analysis of adolescent idiopathic scoliosis. Eur Spine J 20, 1745–1750 (2011). https://doi.org/10.1007/s00586-011-1869-4

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  • DOI: https://doi.org/10.1007/s00586-011-1869-4

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