Can epidural fibrosis or residual compression after lumbar surgery contribute to persistent neuropathic pain?

Post-lumbar-surgery persistent neuropathic pain can arise from several interacting causes. The proposed explanation is biologically and clinically credible: postoperative scar tissue and persistent structural abnormalities may mechanically involve lumbar nerve roots, producing radicular neuropathic symptoms when anatomy and clinical findings align.

Clinical and mechanistic evidence

• Epidural fibrosis can adhere to the dura or nerve roots, potentially causing tethering, traction, stretching, or local irritation. This is a supported mechanism, although scar formation is common after surgery and its presence alone does not establish that it is painful.
• Residual or recurrent structural compression—such as disc material, spinal or foraminal stenosis, bony impingement, or hardware-related compromise—can directly compress or displace a nerve root. This mechanical pathway has strong support.
• Nerve-root compression, irritation, or tethering can cause radiculopathy and contribute to ongoing neuropathic pain, particularly when pain or sensory symptoms follow a specific root distribution and correspond to neurologic examination and imaging findings.

Diagnostic interpretation

• Imaging abnormalities require clinical correlation. A prospective postoperative cohort found that scar size and location were not associated with pain or outcome, while a selected symptomatic cohort reported an association between fibrosis grade and symptom patterns. Neither observation alone proves fibrosis caused symptoms.
• MRI with and without gadolinium can help distinguish enhancing postoperative fibrosis from residual or recurrent disc material and assess nerve-root compression. CT or radiographs can add information about fusion status, hardware, and bony narrowing.

Bottom line

• Epidural fibrosis and residual structural compression can plausibly and, for structural compression, well-establishedly contribute to persistent neuropathic pain after lumbar surgery. In this 83-year-old man, they should be considered potential contributors only if symptoms, examination findings, operative history, and appropriately interpreted imaging identify the same affected nerve root.