Cureus 2026 (Mar 25); 18 (3): e105827

Table 4. Case 2: Comparison of anterior-posterior (AP) radiographs .

X-ray 1 was acquired on 02/05/2024.

X-ray 2 was acquired on 04/04/2024.

The Risser-Ferguson angle is determined by identifying the most tilted vertebrae at the superior and inferior ends of the curve and the vertebra located at the apex of the curvature.

Lines are then drawn connecting the centers of these vertebral bodies. The angle formed between these lines represents the magnitude of the spinal curve.

The Cobb angle is calculated by drawing lines along the superior endplate of the upper end vertebra and the inferior endplate of the lower end vertebra of the curve.

This is followed by constructing perpendicular lines from these endplate lines. The angle formed at the intersection of these perpendiculars represents the Cobb angle.

Metric	Normal Values	X-ray 1 Values	Difference From Normal (X-ray 1)	X-ray 2 Values	Difference From Normal (X-ray 2)	% Change X-ray 1→2
Risser-Ferguson Angle T12-L4 (L2)	0º	54.2º	54.2º	50.5º	50.5º	6.8%
Cobb Angle T12-L4	0º	74.0º	74.0º	71.1º	71.1º	3.9%