Why Does My Back Still Hurt After Surgery?
Failed back surgery syndrome is ongoing or returning pain after spinal surgery. It does not mean the surgery was done badly. Often, the original scan missed an alignment or compensation issue that only shows when you are standing and weight-bearing. A full standing assessment can reveal what lying-down imaging could not.
Key Takeaways
- Up to 40% of people who have spinal surgery continue to experience significant pain afterwards.
- The cause is not always at the surgical site. Your body may be compensating elsewhere.
- Standard lying-down scans can miss alignment problems that appear only when standing.
- An EOS standing scan captures your entire spine, pelvis and legs in one weight-bearing image.
- Understanding your whole-body alignment can help guide the right next step, whether that is further treatment, rehabilitation or a second opinion.
What is failed back surgery syndrome?
Failed back surgery syndrome, sometimes called post laminectomy syndrome or persistent spinal pain syndrome, is a broad term for ongoing back or leg pain after one or more spinal operations. The name is misleading. It does not necessarily mean the surgeon made an error. In many cases, the surgery addressed the problem it was designed to fix, but pain persists because another factor was not identified beforehand.
That factor is often alignment. Your spine does not work in isolation. It connects to your pelvis, hips and legs. If the overall balance between those structures is not considered, surgery on one segment can leave the bigger picture unchanged, or even create new stresses elsewhere.
What does back pain after surgery feel like?
Pain after spinal fusion or decompression can take many forms. Some people notice the same pain they had before, while others develop new symptoms in a different area. Common patterns include the following.
The original ache comes back weeks or months after surgery, sometimes gradually.
Discomfort shifts to the hip, buttock, thigh or the segment above or below the surgical site.
Difficulty bending, walking or standing for long periods, especially after a fusion.
Shooting pain, tingling or heaviness in one or both legs that may worsen when upright.
Important. If you develop sudden weakness in your legs, loss of bladder or bowel control, or numbness in the area around your groin or back passage, seek urgent medical attention. Contact your GP, call 111 or go to A&E. These symptoms need immediate assessment.
Why does pain persist after spinal surgery?
There is rarely one single reason. Pain after spinal surgery usually involves a combination of factors, and several may be present at the same time.
After a fusion, the levels above or below work harder, which can accelerate wear at those segments.
If your spine's front-to-back curve is not restored properly, your body leans forward and muscles strain to keep you upright.
Post-surgical scarring around nerves (epidural fibrosis) can cause nerve irritation or tethering.
Long-term pain can change the way your nervous system processes signals, keeping pain active even after the original problem is addressed.
Your pelvis may tilt, your knees may bend slightly, or your hips may shift. These compensations create new sources of strain that lying-down scans cannot detect.
Many of these issues involve facet joint arthropathy or spinal stenosis at levels that were not part of the original operation. You can read more on our back pain clinic page.
How does a standing scan show what lying-down imaging misses?
Standard post-operative imaging, including X-ray, CT and MRI, is usually done while you lie down. When you lie flat, gravity is removed. Your muscles relax. Your spine settles into a position it would never hold in real life. That means alignment problems, pelvic tilts and compensation patterns can disappear from the image entirely.
An EOS scan is different. You stand naturally in the scanner, weight-bearing, just as you would in daily life. The system captures your entire skeleton from head to feet in a single image using about 90% less radiation than a standard X-ray, around ten times less. This means your consultant can see whether your spine, pelvis and legs are working together, or whether one area is compensating for another.
For someone with pain after spinal fusion, this is especially valuable. A standing image can reveal pelvic retroversion (where your pelvis tilts backward to counterbalance a stiff spine), knee flexion (where you unconsciously bend your knees to stay upright), or sagittal imbalance where your head drifts forward of your pelvis. None of these show up reliably when you are lying flat.
At ScanAlign, standing EOS imaging in London, we produce a detailed alignment report that your surgeon, physiotherapist or pain specialist can use to plan your next steps. Learn more about when doctors recommend an EOS scan.
When MRI is the better tool. EOS shows bones, joints and alignment. If your team needs to assess soft tissue, disc problems, nerve compression or scar tissue around the spinal cord, MRI is usually the right choice. Many people benefit from both, each answering a different question.
What should you do if your back still hurts after surgery?
Start by understanding the full picture. If your post-operative scans were done lying down, there may be alignment information that has never been captured. A standing assessment does not replace the opinion of your surgical team, but it can add a piece of the puzzle they have not yet seen.
If you are considering a second opinion about your back surgery, a standing alignment scan gives your new consultant objective, weight-bearing data to work with.
Book a free video consultationYou do not need a GP referral to book an independent standing assessment. Many people come to us after surgery, either with a consultant's recommendation or on their own initiative. We send the full report directly to whoever is managing your care.
Frequently asked questions
It is a term for ongoing or new pain after spinal surgery. It does not mean the operation was performed incorrectly. Often it means the original cause of pain was not fully identified, or a new source of strain has developed.
Studies suggest that a significant proportion of people, sometimes estimated at up to 40%, continue to experience meaningful pain after spinal surgery. The figure varies depending on the type of surgery and the condition being treated.
Yes. When you lie flat, gravity is removed and your muscles relax. Alignment issues such as pelvic tilt, sagittal imbalance and compensation patterns can be invisible. A standing EOS scan captures your skeleton under real weight-bearing conditions.
Yes. EOS uses low-dose X-ray technology, not magnets, so metal implants are not a concern. The scan uses about 90% less radiation than a standard X-ray, around ten times less.
No. You can self-refer. Many people come to us independently after surgery. We send the report to whichever clinician is managing your care.
It produces a full-length image of your skeleton from head to feet while you stand. This shows the alignment of your spine, pelvis, hips, knees and ankles, and reveals how each area relates to the others under gravity.
The scan itself does not make treatment recommendations. It provides detailed alignment data that your surgeon or specialist can use to decide whether revision surgery, rehabilitation or another approach is most appropriate.
We are a private, self-pay clinic. You can find current pricing and what is included on our FAQs and cost page.
They describe the same situation. Post laminectomy syndrome is an older medical term. Failed back surgery syndrome and persistent spinal pain syndrome are the names more commonly used today. All refer to ongoing pain after spinal surgery.
Start with a free video consultation. We will discuss your history, explain what the scan involves and confirm it is the right step for you. There is no obligation to proceed.
Still in pain after back surgery?
A standing alignment scan can show what lying-down imaging may have missed. Start with a free, no-obligation video consultation.
Book a free video consultationSources
- Daniell JR, Osti OL. Failed Back Surgery Syndrome: A Review Article. Asian Spine Journal. 2018;12(2):372-379.
- Glassman SD, et al. The impact of positive sagittal balance in adult spinal deformity. Spine. 2005;30(18):2024-2029.
- National Institute for Health and Care Excellence (NICE). Low back pain and sciatica in over 16s: assessment and management. NG59. 2016 (updated 2020).
Written by Abbas Dhami (Specialist Diagnostic Radiographer)
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.