Illustrated Cobb angle
Grab a handle and pull it to one side to create a curve. Pull two handles opposite ways for a double (S-shaped) curve.
Stylized educational illustration — not a diagnostic measurement.
Try a guided angle-measurement lesson
1. Create an example curve above. 2. Choose two model vertebrae. 3. Compare their endplate tilts below.
The vertebrae are numbered from the top of this illustration. These are model positions, not named spinal levels or an X-ray.
Try nearby vertebrae to see why the choice of endplates matters. The lines are moved to a shared center here to compare their tilt. Clinical measurement requires an appropriate image and trained interpretation.
About measurement and care
The dashed lines follow the selected vertebral endplates. Their difference in tilt produces the illustrated angle. Clinical measurement uses a standing X-ray.
For adolescent idiopathic scoliosis, observation, bracing, and surgery are considered in the context of remaining growth and progression. Adult care also depends on symptoms and function.
Learn more from the Scoliosis Research Society: Diagnosis · Bracing · Surgery.