Mild Annular Bulge & Facet Hypertrophy: What It Means for Your Spine

These are common degenerative MRI findings, often asymptomatic.

Terminology

• Annular Bulge: Broad-based disc extension beyond vertebral margins (<25% circumference). “Mild” = minimal protrusion.
• Facet Hypertrophy: Enlargement of facet joints (osteoarthritis). “Bilateral” = both sides.
• 3 mm Posterior Central Protrusion: Focal disc displacement posteriorly. Small; may not contact neural elements.

Clinical Significance

• Asymptomatic Majority: >50% of pain-free adults have similar findings.
• Symptomatic If: Compresses nerve root (radiculopathy: pain, numbness, weakness in dermatome) or spinal cord (myelopathy: gait disturbance, hand clumsiness, sensory level).
• Facet Hypertrophy → mechanical back pain, stenosis contribution.

Management

• No treatment needed if incidental.
• If symptomatic: PT (core, McKenzie), NSAIDs, activity modification, epidural steroid injections.
• Surgery only for progressive neurologic deficit or intractable pain failing 3–6 mo conservative care.

Correlate imaging with clinical exam. Findings ≠ diagnosis without symptoms.