What is failed back surgery syndrome?

“Failed back surgery syndrome” is a poor name for a real thing, because it implies the operation failed. Usually it did not. The fusion is solid. The decompression is adequate. The hardware is where it should be. The post-operative film (the X‑ray after surgery) is exactly what the surgeon hoped for.

What that film cannot show is why you still hurt. There are five common reasons, and they can be told apart. That is the whole point of this page. It matters because, treated as one diagnosis, “failed back surgery” leads to one more operation. Treated as five possibilities, it leads to a test.

What causes pain after back surgery, and how is each cause found?

Why nobody is looking

There is a structural reason this group is under-served. It is worth naming plainly because it is an incentive problem, not a failure of individuals. The surgeon’s question is whether the operation reached its technical goal, and it did. The referring physician sees a post-operative spine and a good film. Nobody’s job is to ask which structure is generating pain in a spine that has already been operated on. So nobody asks it.

Meanwhile the patient has been through a major operation, a long recovery and an expectation of relief. That makes it socially costly to report ongoing pain. People in this position play it down. Playing it down gets recorded as improvement.

Why does the nervous system keep hurting after surgery?

A spine that hurt for two years before an operation has been sending nociceptive (pain) traffic into the dorsal horn of the spinal cord for two years. That input makes real, measurable changes. Thresholds drop. Receptive fields widen. Descending inhibition (the brain’s own pain brake) weakens. The nervous system has learned the pain. No operation on bone addresses a learned signal.

Two things keep that state going after surgery. The first is sleep. It is almost always wrecked in this group, and sleep is when descending pain inhibition is restored. Short sleep measurably lowers pain threshold the next day. The second is metabolic inflammation. High inflammatory tone keeps glial cells (the nervous system’s support cells) activated and keeps the system primed. It also slows the healing of the surgical site itself and the fusion mass.

The third factor is the one nobody writes down. This group is disproportionately isolated. They are out of work, out of the activities that carried their social contact, and carrying the particular shame of an operation that did not deliver. Isolation is not just something that goes along with chronic pain. It is one of the better-established amplifiers of it. A plan that treats only the spine leaves the amplifier running.

How is failed back surgery syndrome treated?

We start by throwing out the label. “Failed back surgery” is not a diagnosis we can treat; a symptomatic facet joint at the level above a fusion is. So the workup is the same one that should have come before the operation. Examine. Name a candidate structure. Test it with a block. Treat what was confirmed.

When the answer is adjacent-level facet pain, radiofrequency neurotomy is often durable and does not touch the construct. When it is the sacroiliac joint, that is a different and very treatable answer. When the main finding is sensitization, more procedures will not help, and we will say so. The work there is sleep, graded load, metabolic terrain and the in-house behavioral program. It is slower and less satisfying to describe than an injection.

On medication, plainly: many people arrive here on long-term opioid therapy after a series of disappointing procedures. Nobody will make a taper the condition of being assessed. Nobody will treat the dose as a question of character. Interventional treatment can reduce the input the medication is covering. That is what makes reduction possible where it is wanted. In our own experience, the reduction follows the relief. It does not come first.

Frequently asked questions

Should I have revision surgery?

Sometimes, and specifically when there is a mechanical problem we can demonstrate — pseudarthrosis, hardware failure, a truly inadequate decompression, or instability that can be shown. Revision has a poor record when the problem is adjacent segment facet pain, sacroiliac pain or sensitization. It is worth testing for those three before agreeing to it.

For what to test before agreeing to a revision, read a second opinion before back surgery.

Is the pain in my head?

No. Central sensitization is a physiological state of the nervous system with measurable features. It is not imagined, and it is not a psychiatric diagnosis. It does respond to a different kind of treatment than a joint does. That is why the distinction matters.

For how sensitization shows up when procedures stop helping, read when injections stop working.

How long after surgery should pain have settled?

Pain at the surgical site generally settles over weeks to a few months. Some pain needs investigation, not more patience. That means pain unchanged in character from before the operation, or pain with a new pattern at three to six months.

Do rods and screws break often?

They loosen and sometimes break at documented rates. Those rates are not negligible, particularly when a fusion has not consolidated (fully knit together). Did your pain change character? Did a new mechanical pain appear? Either one is worth imaging specifically for.

Can anything be done this long after?

Yes. The duration changes what is likely to be driving it, not whether it is treatable. A facet joint above a ten-year-old fusion responds to a block the same way it would have at one year.

Is failed back surgery syndrome permanent?

No. The label describes pain that continued after an operation met its technical goal. It is not a fixed state. The work is to name the structure behind it and test it: a facet joint above the fusion, the sacroiliac joint, a hardware problem, or a sensitized nervous system. Facet pain above a fusion often responds durably to radiofrequency neurotomy. Sacroiliac pain is very treatable. Sensitization is treated with sleep, graded load, metabolic work and the behavioral program, which is slower.

My X-ray after surgery looks fine. Why do I still hurt?

Because four of the five common causes do not show up on post-operative imaging. Treating the wrong level, overload at the segment next to a fusion, sacroiliac joint pain and central sensitization are all invisible on the film. Only hardware problems, such as loosening or a broken rod, show up well on a scan. A clean X-ray means the operation did its job. It does not mean the search is over.

Do I have to taper my opioids before you will see me?

No. Nobody here makes a taper the condition of being assessed. Nobody treats your dose as a question about your character. Interventional treatment aims to reduce the pain signal the medication is covering. In our experience, that is what makes lowering the dose possible where you want it. The reduction follows the relief rather than coming first.

Many people with pain after surgery use TENS for back pain in the clinic, and a home unit if their physician orders one.

Related reading

• The diagnostic block, explained
• Sacroiliac joint pain
• Radiofrequency neurotomy
• Sleep and back pain
• Before you agree to the operation

Where a trial of stimulation fits after a failed operation.