The Cobb method is most commonly used to quantify curvature in the coronal and sagittal planes (Fig. 10-12). The following steps are involved in this measurement:
1. Identify the end vertebra of the curvature whose measurement is desired.
2. Construct lines along the superior aspect of the upper end vertebra and along the inferior aspect of the lower end vertebra.
3. Next construct lines perpendicular to the lines previously drawn along the end vertebra. Measure the angle between these two lines with a protractor or digital software to determine the Cobb angle.
4. In large curves it is possible to measure the Cobb angle directly from the lines along the end vertebra without the need to construct perpendicular lines.
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