| There’s no single magic number for adults. While curves beyond roughly 45–50 degrees are more likely to progress, the decision to operate in adults depends far more on symptoms, documented progression, nerve compression, and overall spinal balance than on the Cobb angle alone. Two people with the same angle can have very different plans. |
Medically reviewed by Kanwarpaul Grewal, DO — Orthopedic Spine Surgeon, UCSF Complex Spine & Deformity Fellowship. Reviewed July 2026.
Why the angle isn’t everything
In adults, disability tracks with sagittal balance and nerve symptoms more than with the raw degree of curve. A well-balanced 50-degree curve may need nothing; an imbalanced smaller curve may cause real problems.
Who should decide
A surgeon with deformity-specific training. Dr. Grewal completed the UCSF Complex Spine & Deformity Fellowship.
Sources: Scoliosis Research Society; SRS-Schwab classification (Spine).
