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The geometry of the spine in the sagittal profile: a comparison of girls with and without scoliosis

Background

Using the Formetric® system, we observed a high incidence of abnormal sagittal configurations in both scoliotic and non scoliotic patients. Those abnormal configurations could be described by using terms like Hyper- or Hypo- but not all of them. Changes in the location of the thoracic apex, lordotic apex, transitional point as well as segmental rectifications of the profile were observed with the formetric. This data is used to define a specific scale and to measure harmony of the spine (HDSS). This new, simplified scale is clinically valid and is reliable. The HDSS ranges from 0 (harmonic) to 16 (disharmonic).

Goal

The purpose of the study is to compare the sagittal configuration of scoliotic patients and normal subjects.

Materials and methods

We have studied the sagittal profile with the Formetric® system in 157 consecutive girls with non-treated IS and 39 age matched non scoliotic girls (NIS).

Results

The HDSS showed no differences in both groups (IS = 5.6; NIS = 5.4). The angle of the regional kyphosis was no different in scoliotic (43.1°) and non scoliotic (43.7°) girls. The angle of the regional lordosis was significantly lower in scoliotic girls (34.9°) compared with non scoliotic (35.4°). Harmonic/disharmonic features are similar for both scoliotic and non scoliotic girls.

Conclusion

The sagittal geometry of the spine is highly variable in both scoliotic and non scoliotic girls. The angle of thoracic kyphosis is not different between the groups. Lordosis is slightly lower in the scoliotic group.

References

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    Duval Beaupere G, Taussing G, Mouilleseaux B, Pries P, Mounier C: Pronostic Factors for Idiopathic Scoliosis. In: Dr Jean Dansereau Scientific editor: International Symposium on 3D Scoliotic Deformities joined with the VIIth International Symposium on Spinal Deformity and Surface Topography. Éditions de l'École Polytechnique de Montréal. 1992, Gustav Fisher Verlag, 211-216.

  2. 2.

    Singer KP, Goh S, Leedman P, Price RI: Reliability of Rasterstereography of Thoracic Kyphosis. Stud Health Technol Inform. 1999, 59: 29-32.

  3. 3.

    Rigo M, Quera-Salva G, Villagrasa M: Sagittal configuration of the spine in girls with idiopathic scoliosis: Progressing rather than initiating factor. Stud Health Technol Inform. 2006, 123: 90-94.

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Author information

Correspondence to Manuel Rigo.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Keywords

  • Public Health
  • Thoracic Kyphosis
  • Specific Scale
  • Transitional Point
  • Sagittal Profile