, 4:O15 | Cite as

The use of surface topography in the surveillance of adolescent idiopathic scoliosis: the influence of patient BMI on the reliability of curve measurement

  • Patrick Knott
  • Steven Mardjetko
  • Megan Dunn
  • Jennifer Yatchek
  • Tatiana Anthony
Open Access
Oral presentation


Public Health Body Mass Index Negative Correlation Curve Analysis Surface Topography 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


There are several methods available using surface topography to estimate the spinal curves in adolescent scoliosis patients. One new method, using the Ortelius 800 device, has been shown to be unreliable [1]. This study will analyze whether the reliability of measurements is related to the patient's Body Mass Index (BMI).


Adolescent patients being screened or observed for scoliosis had their curves evaluated using standard radiographs. They also underwent an evaluation using the Ortelius 800 machine, which provides curve analysis and Cobb angles of the patient's spine. Finally, height and weight were obtained and BMI was calculated.


For each patient, the difference between the Orthoscan measurement and the x-ray measurement was calculated, and then this difference was compared to the patient's BMI. Results showed that there was a negative correlation between BMI and the reliability of the measurements made using surface topography.


Procedures using surface topography to predict the magnitude of the Cobb angle in adolescents may be much less effective in patients with an elevated BMI.


  1. 1.
    Knott P, Mardjetko S, Nance D, Dunn M: Electromagnetic Topographical Technique of Curve Evaluation for Adolescent Idiopathic Scoliosis. Spine. 2006, 31: 24-10.1097/01.brs.0000245924.82359.ab.CrossRefGoogle Scholar
  2. 2.
    Doody MM, Lonstein JE: Breast Cancer Mortality After Diagnostic Radiography. Spine. 2000, 25: 2052-2063. 10.1097/00007632-200008150-00009.CrossRefPubMedGoogle Scholar
  3. 3.
    Nash CL: Risks of exposure to x-rays in patients undergoing long-term treatment for scoliosis. J Bone Joint Surg Am. 1979, 61: 371-374.PubMedGoogle Scholar
  4. 4.
    Hoffman DA: Breast Cancer in Women with Scoliosis Exposed to multiple diagnostic X-Rays. J National Cancer Inst. 1979, 81 (17): 1307-1312. 10.1093/jnci/81.17.1307.CrossRefGoogle Scholar
  5. 5.
    Dalia Dickman, Oren Caspi: Assessment of Scoliosis with Ortelius 800: Preliminary Results. Clinical Application Notes. 2001, 1-7.Google Scholar

Copyright information

© Knott et al; licensee BioMed Central Ltd. 2009

This article is published under license to BioMed Central Ltd.

Authors and Affiliations

  • Patrick Knott
    • 1
  • Steven Mardjetko
    • 2
  • Megan Dunn
    • 3
  • Jennifer Yatchek
    • 1
  • Tatiana Anthony
    • 1
  1. 1.Rosalind Franklin University of Medicine and ScienceNorth ChicagoUSA
  2. 2.Department of OrthopaedicsRush UniversityChicagoUSA
  3. 3.Illinois Bone and Joint InstituteMorton GroveUSA

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