For an adult with symptomatic low-back pain due to spondylolisthesis who has not responded to NSAIDs, activity modification, and physical therapy, how should bilateral pars (facet) injections be performed, including medication mixture, dosage, and post-procedure care?

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Last updated: September 21, 2026 • View editorial policy

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Do Not Perform Bilateral Pars (Facet) Injections for Spondylolisthesis

Based on the most recent high-quality evidence, bilateral pars/facet injections should NOT be performed for symptomatic spondylolisthesis, as the 2025 BMJ guideline provides a strong recommendation AGAINST therapeutic facet block injections for chronic low back pain. 1

Why This Recommendation Matters

The 2025 BMJ clinical practice guideline explicitly states that "all or nearly all well-informed people would likely not want such interventions" and that "such interventions should therefore not be offered outside of a clinical trial." 1 This represents the highest quality, most recent evidence available and directly addresses your clinical scenario.

The Evidence Landscape

Strong Evidence Against Facet Injections

  • The 2021 ACOEM guideline specifically states that "therapeutic facet block injections are not recommended for chronic low back pain or any radicular pain syndrome" 1
  • The 2020 NICE guideline advises "do not offer spinal injections for managing low back pain" 1
  • These recommendations are consistent across multiple high-quality guidelines when addressing axial (non-radicular) low back pain from spondylolisthesis

The Conflicting Landscape

While the 2022 ASPN guideline provides a "strong recommendation in favour" of sacroiliac joint injections and radiofrequency ablation 1, the 2025 BMJ guideline notes that consensus-based guidelines (like ASPN) "are more likely to produce recommendations that violate the principles of evidence based medicine" 1. The BMJ guideline represents a more rigorous, evidence-based approach.

What Should Be Done Instead

For your patient with symptomatic spondylolisthesis who has failed conservative management:

Next Steps in Management

  1. Consider epidural steroid injections if there is a radicular component (leg pain suggesting nerve root involvement), as these have moderate support for disc-related pathology 1

  2. Evaluate for surgical candidacy - The patient has failed NSAIDs, activity modification, and physical therapy, which represents adequate conservative treatment failure 2

  3. Reassess the pain pattern - If pain is truly axial (back-dominant) without radicular features, surgical consultation for decompression ± fusion may be more appropriate than any injection therapy 3, 2

Critical Safety Considerations

If facet injections were to be performed despite this recommendation, be aware that:

  • Small risk of serious harms including deep infection and altered consciousness 1
  • Very small risk of catastrophic complications including paralysis and death (particularly with epidural approaches) 1
  • Cost and access barriers requiring repeated procedures every 2 weeks to 3 months 1
  • Limited durability even when effective, with most benefit lasting less than 4 weeks 4

The Bottom Line

The evidence does not support performing bilateral pars/facet injections for spondylolisthesis-related axial low back pain. The 2025 BMJ guideline provides the clearest, most recent, and highest-quality recommendation against this intervention. Your patient would be better served by either epidural injections (if radicular symptoms present) or surgical evaluation given the failure of comprehensive conservative management.

References

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.