Herniated Discs and Scoliosis: Relationship, Mechanisms, and Management

Scoliosis (lateral spinal curvature >10° with rotation) does not directly cause disc herniation, but the altered biomechanics increase risk at specific levels.

Biomechanical Link

• Asymmetric loading: Concave side → increased compression; convex side → tension/distraction.
• Disc degeneration: Accelerated on concave side (compression) and at curve apex (shear).
• Facet joint overload: Especially at apex and transition zones.
• Altered kinematics: Coupled rotation reduces segmental motion → adjacent segment stress.

Common Herniation Patterns in Scoliosis

• Lumbar curves: Herniations at L3–L4, L4–L5 (apex/transition); often far-lateral or foraminal on concave side.
• Thoracolumbar curves: T12–L1, L1–L2.
• Double major curves: Multiple levels at risk.

Clinical Presentation

• Radiculopathy (sciatica) from foraminal stenosis + herniation.
• Back pain (mechanical + discogenic).
• Neurogenic claudication if central stenosis coexists.

Imaging

• Standing full-spine PA/lateral (Cobb angle, balance).
• MRI: Disc hydration, herniation, nerve compression, facet arthropathy.
• CT: Bony anatomy, foraminal stenosis.

Management

• Conservative: PT (Schroth, core stabilization), NSAIDs, epidural steroid injections (for radiculopathy).
• Bracing: In adolescents (Rigo-Chêneau) to halt progression; not for adults.
• Surgery indications:
  • Refractory radiculopathy + concordant imaging.
  • Progressive curve >45–50° (adolescent) or >30° with imbalance (adult).
  • Neurologic deficit, intractable pain.
• Surgical options: Microdiscectomy ± fusion; deformity correction (pedicle screw constructs) if curve progression or imbalance.

Key Point

Treat the herniation and the deformity context. Isolated discectomy in a scoliotic spine may not address root cause and can accelerate degeneration. Multidisciplinary spine team evaluation is essential.