Failed Back Surgery Syndrome

Epidural fibrosis. Scar tissue forms after any epidural intervention (any procedure in the space around the spinal nerves). When it ties down a nerve root, the nerve can no longer glide as you move. Then it hurts with certain positions and activity. This is the most common finding when leg pain comes back some months after a decompression that otherwise worked.

Adjacent segment change. A fused level does not move. So the levels above and below take more load. Over years, they wear out faster. The pain comes back next to the first surgery, not at it.

The facet joints. Often the first pain came from the facet joints, and the disc on the scan was a side finding. Decompressing a disc that was never the source leaves the real source untouched.

The sacroiliac joint. Often missed, and more likely after lumbar fusion, because load shifts to the pelvis. It sends pain to the buttock and back of the thigh. That pattern is easy to mistake for a pinched nerve coming back.

The wrong level, or the wrong structure entirely. When a disc level is still in question, a selective nerve root block tests it directly. The deep buttock muscles get tested the same way — a well-placed block that changes nothing is still information.

Central sensitization. After a long stretch of pain with no relief, the nervous system turns up the volume on its own. That has nothing to do with the first injury. This is real and treatable. But it is a different problem, and it needs a different treatment.

Scans after spine surgery are truly hard to read. Hardware blurs the picture. Changes from surgery look abnormal in everyone. And scar is hard to tell apart from a disc that came back on a still image. Reading an MRI after surgery on its own, and treating whatever looks worst, is how patients end up with a second operation that does not help either.

We lean harder on two things. Electrodiagnostic testing shows, by measurement, whether a nerve root is working poorly and at which level. That does not depend on what the images show. And diagnostic blocks answer the question directly. Numb one specific part, and see whether the pain changes.

A facet block, an SI joint injection or a selective nerve root block each tests one specific guess. The answers add up to a diagnosis.

Where scar tissue is tethering a nerve — epiduroplasty uses a thin tube, guided by live X-ray (fluoroscopy), to break up scar bands. It delivers medicine right to the trapped nerve. That gives back some of the nerve’s ability to move freely.

Where the facet joints are confirmed — radiofrequency ablation of the medial branch nerves gives longer relief than repeat injections.

Where neuropathic pain is established and diffuse — spinal cord stimulation has its strongest evidence in exactly this group of patients. The landmark randomized comparison, Kumar and colleagues in Pain in 2007, tested stimulation against standard medical care. It studied failed back surgery syndrome specifically.

Where central sensitization dominates — the work changes: ketamine for refractory nerve pain, counseling, and metabolic and inflammatory treatment.

We will not manage this with more and more medicine alone. Our approach puts procedures first. It is set out plainly in our opioid stewardship protocol. We do not offer long-term opioid therapy without procedures to back it up.

We also will not promise we can always find a diagnosis. Sometimes several sources add to the pain and no single one leads. In that case we say so. The goal then shifts, honestly, from cure to function. That is a fair goal. But you should reach it after the diagnostic work, not in place of it.