MRI Predictors for Improvement Without Any Intervention of Clinical Symptoms in Patients With Lumbar Disc Herniation, Questioning the True Need for Surgery

Why This Matters

Lumbar disc herniation is one of the most common reasons patients are referred for surgery. However, many patients improve naturally through a process of spontaneous disc resorption. The challenge is identifying which patients are likely to recover without intervention. This study provides clinically useful MRI predictors to help guide that decision.

What the Research Found

This prospective study evaluated MRI findings in patients with lumbar disc herniation to determine which features predict spontaneous symptom resolution without any treatment.

Key Predictors:

  1. Disc Morphology (Fardon Classification)
  • Disc extrusions were nearly 9 times more likely to improve without surgery compared to focal protrusions
  1. Middle Disc Height (MDH)
  • Greater disc height significantly increased the likelihood of recovery
  • Approximate thresholds associated with better outcomes:
    • L3–4: ~9.4 mm
    • L4–5: ~8.9 mm
    • L5–S1: ~9.1 mm

Combined Effect:

  • Patients with both:
    • Disc extrusion, and
    • Preserved disc height (above threshold)
  • Had approximately 22.5× greater likelihood of spontaneous improvement

Clinical Takeaways

    • Recognize that disc extrusions are more likely to improve than protrusions
    • Evaluate disc height as a key prognostic factor, not just herniation size or presence
    • Use MRI to stratify recovery potential, rather than defaulting to intervention
    • Consider conservative care in patients with:
    • Understand that reduced disc height may reflect a less favorable biomechanical environment and may require closer monitoring

Where Collaborative Spine Care May Support This

This study strengthens the role of conservative spine care in appropriately selected patients. Chiropractors—who provide the majority of spinal manipulation in the United States—are well positioned to help manage these cases, monitor progression, and support recovery while natural healing processes such as disc resorption occur. Identifying favorable MRI patterns allows for more confident, evidence-based non-surgical care.

Reference

Šprláková-Puková A, Straka M, Habas T, et al. MRI Predictors for Improvement Without Any Intervention of Clinical Symptoms in Patients With Lumbar Disc Herniation, Questioning the True Need for Surgery. Radiology Research and Practice. 2026.