基于摄影测量法的Cobb角评估数学程序的验证
Validation of a Mathematical Procedure for the Cobb Angle Assessment Based on Photogrammetry.
作者信息
Navarro Isis Juliene Rodrigues Leite, Candotti Cláudia T, Furlanetto Tássia S, Dutra Vinícius H, do Amaral Maiane A, Loss Jefferson F
机构信息
Biomechanics Department, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
出版信息
J Chiropr Med. 2019 Dec;18(4):270-277. doi: 10.1016/j.jcm.2019.01.001. Epub 2020 Sep 3.
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 ≤ .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.
目的
本前瞻性研究旨在通过摄影测量法评估一种测量脊柱倾斜角的数学方法的同时效度和诊断准确性，该方法类似于 Cobb 角测量法。
方法
61 名年龄在 7 至 18 岁之间的男女受试者接受了影像学（Cobb 角）和摄影测量学（DIPA [基于数字图像的姿势评估] 角）评估。通过摄影测量获得的脊柱倾斜角测量遵循基于数字图像的姿势评估软件协议。采用 Spearman 等级相关性、决定系数、均方根误差、Bland-Altman 图分析和受试者工作特征分析评估同时效度，采用α≤0.05。
结果
根据脊柱侧弯曲线的部位（胸椎、腰椎或胸腰段）进行分析。所有脊柱区域的相关性都非常好（从 0.72 到 0.81）且具有显著性，决定系数在 0.75 到 0.88 之间。均方根误差在 5°至 11°之间，平均差异非常接近 0。曲线下面积非常好且具有显著性，在 95%至 99%之间。
结论
所提出的数学方法对于通过摄影测量法评估脊柱倾斜角是有效的，类似于通过影像学评估 Cobb 角。
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