Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 26364
  Title Validation of a mathematical procedure for the Cobb angle assessment based on photogrammetry
URL https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7486467/
Journal J Chiropr Med. 2019 Dec;18(4):270-277
Author(s)
Subject(s)
Peer Review Yes
Publication Type Article
Abstract/Notes

Objective: This prospective study aimed to assess the concurrent validity and diagnostic accuracy of a mathematical procedure for measurement of the spinal inclination angle, analogous to the Cobb angle, by means of photogrammetry.

Methods: Sixty-one subjects (aged 7 to 18 years), male and female, underwent radiographic (Cobb angle) and photogrammetric (DIPA [Digital Image-based Postural Assessment] angle) evaluations. The measurement of spinal inclination angle obtained through photogrammetry followed the Digital Image-Based Postural Assessment software protocol. Concurrent validity was appraised using Spearman rank correlation, the coefficient of determination, the root-mean-square error, Bland-Altman plot analysis, and receiver operating characteristic analysis, adopting P ≤ .05.

Results: The analyses were divided according to the topography of the scoliotic curve (thoracic, lumbar, or thoracolumbar). The correlations were excellent (from 0.72 to 0.81) and significant for all the regions of the spine, and the coefficients of determination ranged between 0.75 and 0.88. The root-mean-square error was between 5° and 11°, and the mean difference was very close to 0. The area under the curve was excellent and significant, ranging between 95% and 99%.

Conclusion: The mathematical procedure presented is valid to evaluate the spinal inclination angle in photogrammetry, analogous to the Cobb angle in radiography.

Author keywords: Scoliosis; Photogrammetry; Posture

Author affiliations: Biomechanics Department, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil

This abstract is reproduced with the permission of the publisher; click on the above link for free full text. PubMed Record | PDF

 
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