Epidural lysis of adhesions for epidural fibrosis after back surgery targets a very specific problem: post-surgery scar tissue (epidural fibrosis) that can tether a nerve root and block medication from spreading where it needs to. The reason you still feel pain months after “successful” imaging is that the assembly line often stops at the operation report, not the pain mechanism, and epidural fibrosis is a dominant culprit.
How We Diagnose Epidural Fibrosis (And Why MRI Can Miss It)
Diagnosis is not a single test. It is a process of narrowing the pain generator, then selecting a procedure that matches that generator.
Epidural lysis of adhesions for epidural fibrosis after back surgery is most defensible when your story, exam, and targeted testing converge on epidural fibrosis and nerve root tethering as a plausible mechanism. That does not mean “MRI must be positive.” It means we understand how the imaging performs.
One of the most important diagnostic points is that MRI can miss low-grade epidural fibrosis. In a prospective series of 61 patients with failed back surgery syndrome, six patients had grade 1 fibrosis on epiduroscopy while none showed fibrosis on MRI, and the authors concluded epiduroscopic imaging appears more sensitive than MRI for detecting grade I epidural fibrosis.1 That is not a reason to ignore MRI. It is a reason to stop using “negative MRI” as a hard stop.
Because of this mismatch, patients with failed back surgery syndrome can still have clinically relevant adhesions even when MRI looks non-specific. The failure is not in the first six weeks. It is at month four, when the assembly line offers two exits and neither one contains a diagnosis.
Who Is a Candidate, and Who Should Not Be Sold This Procedure
We evaluate candidacy by asking a blunt question: does it look like epidural fibrosis and tethering are plausible drivers of your pain, not just a side finding?
Epidural fibrosis is a recognized contributor to persistent pain after spine surgery, and the extent of fibrosis tends to increase with the number and extent of prior surgeries.1 Published estimates of how often it is the primary pain generator vary widely, so we treat it as one plausible mechanism to test rather than a settled majority cause. That supports the premise. It does not mean every person with post-surgical pain should get adhesiolysis.
Who we tend to consider includes patients with persistent or recurrent radicular symptoms after prior surgery, with concordant pain patterns and testing that supports nerve involvement. If you already tried appropriately targeted epidural steroid injection or other nerve root targeted interventions, but medication distribution failed or relief was minimal, adhesiolysis becomes more logically connected to mechanism.
Who we should be cautious about includes patients whose main issue is primarily non-epidural (for example, predominant facet-mediated pain, sacroiliac-mediated pain, a new compressive lesion that requires a different pathway, or widespread central sensitization with minimal peripheral concordance). In those cases, adhesiolysis may add risk without addressing the main signal generator.
Whether there is benefit in your specific case depends on your pain generator mapping. That mapping is also where we incorporate metabolic pain management and other adjunct drivers, because chronic pain does not exist in isolation.
Expected Outcomes, Complications, and What the Evidence Actually Says
Let’s talk about the numbers without pretending they settle everything. In a multicenter retrospective study of 115 patients treated for failed back surgery syndrome (n = 104) or spinal stenosis (n = 11), 48.7% (95% CI 39.3%–58.1%) experienced a positive outcome, defined as at least 50% pain relief lasting at least one month.2 That is not a universal success rate, but it is a clinically relevant response rate in selected patients.
Medication additives are where patients often want certainty. In that same study, the use of hyaluronidase did not correlate with outcomes in univariable analysis (odds ratio 1.2, 95% CI 0.6 to 2.5, P = 0.65).2 In plain terms, that dataset did not show it reliably improves outcomes.
Now the risk conversation. Reported complication rates vary between series because studies count complications differently, so a single pooled number would be misleading. Different studies count complications differently, so the exact rate is hard to pin down as a single number you can guarantee. But you should treat the procedure as medical, not cosmetic.
What evidence does not support is marketing-like claims of guaranteed durable relief. The sham trials were not wrong, and there is no honest way to pretend they were. The defensible position is narrower than “cement works,” and it is this: if you do not look like VAPOUR’s patients, outcomes cannot be assumed. (In other words, your case needs matching to the mechanism profile used in studies.)
Also be aware that at least one medical policy document describes lysis of epidural adhesions as investigational and not medically necessary. That does not automatically mean it never helps. It means the payer perspective often depends on the strength and consistency of evidence, and not every payer uses the same thresholds for access.
Frequently asked questions
Is epidural lysis of adhesions worth it if my MRI did not show severe scar?
Yes, it can still be worth discussing if your symptoms and prior injection response fit epidural fibrosis. MRI is approximately five times less likely to detect high-grade epidural fibrosis than endoscopic assessment, so a non-severe MRI does not automatically rule it out. See epiduroplasty and epidural lysis of adhesions for how this is evaluated.
How is epidural fibrosis after surgery diagnosed before epidural lysis of adhesions?
Diagnosis is usually clinical and procedural, not just imaging. We look at your failed back surgery syndrome timeline, nerve-root symptom patterns, prior treatments like epidural steroid injection, and diagnostic block results when available.
What are the risks of epidural lysis of adhesions?
Complications are uncommon but not rare, with one 2025 summary reporting about 9 in 100 people had complications. Your risk depends on your anatomy, medications, and prior surgery details, which is why patient selection and informed consent matter. See epidural steroid injection for how this is evaluated.
Does hyaluronidase improve outcomes for epidural lysis of adhesions?
In one multicenter retrospective dataset, hyaluronidase did not correlate with outcomes in univariable analysis. That means the evidence for routine benefit from hyaluronidase is not strong. See selective nerve root block for how this is evaluated.
How long does pain relief last after epidural lysis of adhesions?
In the multicenter study by Hsu and colleagues (2014), a positive outcome was defined as at least 50% pain relief lasting at least one month, and 48.7% of the 115 patients met it. Individual durability varies, and some patients need a broader chronic pain treatment plan to address central sensitization, not just the pain signal. See why leg pain persists after back surgery for how this is evaluated.
To discuss your own case, request an appointment through the appointment request form, call (314) 481-5000, or text (314) 886-5902. You can review the full range of pain treatments, read about the pain management doctors in St. Louis, or find both offices on the locations page.
Sources
- Guner D, Asik I, Ozgencil GE, Peker E, Erden MI. “The Correlation of Epidural Fibrosis with Epiduroscopic and Radiologic Imaging for Chronic Pain after Back Surgery.” Pain Physician, 2021;24(8):E1219–E1226. Prospective trial, 61 patients with failed back surgery syndrome. PMID 34793648
- Hsu E, Atanelov L, Plunkett AR, Chai N, Chen Y, Cohen SP. “Epidural lysis of adhesions for failed back surgery and spinal stenosis: factors associated with treatment outcome.” Anesthesia & Analgesia, 2014;118(1):215–224. Multicenter retrospective study, 115 patients. doi:10.1213/ANE.0000000000000042
Dr. Gurpreet Singh Padda, MD, MBA, MHP
