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[Comparison between clinical Cobb angles and measurements performed on vertebral bodies, pedicle centroids and
S Delorme1, H Labelle, C E Aubin
1Centre de Recherche, Hôpital Sainte-Justine, Montréal, Québec, Canada. delorme@justine.umontreal.ca
Goal:
Evaluate the relations between the clinical Cobb angle measured on radiographic images and the computerized Cobb angles measured on curves passing through: 1) the vertebral body centroids, 2) the pedicle centroids and 3) the spinous process tips, in the frontal plane, the sagittal plane and the plane of maximum curvature.
Material And Methods:
A bi-planar radiographic technique was used to reconstruct in 3D the spine geometry for 39 adolescent girls having double-curved idiopathic scoliosis. The Cobb angles were measured clinically on the radiographs and were computed on the 3 curves.
Results:
Every relation was found significant and their determination coefficient (R2) was between 0.38 and 0.98. Linear relations were established between clinical and computerized angles. Angles measured on the curve passing through the pedicle centroid correlated best with clinical indices.
Conclusions:
The computerized measurements of Cobb angles from 3D models can be used with confidence and are interchangeable, provided the appropriate conversion factor is used.