You had scoliosis surgery years ago — maybe as a teenager, maybe as a younger adult. At the time, it went well. You recovered, you moved on, and for a long stretch of years life was largely normal. But somewhere along the way things shifted. The back pain that was manageable has become harder to ignore. You notice that you lean forward more than you used to. You fatigue standing in ways you didn’t before. Or maybe you’ve noticed your curve looks different on a recent X-ray, or a rod broke and you’re not sure what that means. You’ve gone back to your original surgeon and been told things look acceptable. Or your original surgeon has retired. Or you’ve been told that nothing more can be done.
This post is for you. What you’re experiencing is not unusual, it is not simply aging, and it is not something that should be accepted without a proper evaluation by someone who specializes in exactly this kind of problem.
Why Scoliosis Surgery Doesn’t Always Stay Fixed
Spinal fusion corrects and stabilizes a defined segment of the spine. What it cannot do is stop the rest of the spine from aging, prevent the discs above and below the fusion from degenerating, or guarantee that the fusion mass will remain solid indefinitely. It also cannot fully predict, at the time of surgery, how the spine will behave decades later as the body’s compensatory reserves diminish.
The spine is a dynamic structure under continuous load. A fusion construct placed at age 16 will be under different mechanical stresses at age 40 than it was at age 20. The disc immediately above the top of the fusion is now absorbing forces that were previously shared across multiple levels. The muscles that compensate for any residual imbalance work reliably at 25 but may begin to fail at 45. The alignment that was adequate at the time of surgery may be insufficient two decades later, particularly if baseline lordosis was not fully restored during the index procedure.
None of this means the surgery was wrong or that a mistake was made. It means that complex spinal fusion — like any major reconstruction — has a finite durability, and that the body it was performed in continues to change after the procedure.
The Most Common Reasons Patients Deteriorate After Prior Scoliosis Surgery
Pseudarthrosis — The Fusion Never Fully Healed
This is the most common and most underdiagnosed cause of persistent or worsening pain after scoliosis surgery. Pseudarthrosis means the bone graft placed during the fusion never consolidated into solid bone at one or more levels within the construct. Instead, a fibrous non-union persists — a zone of micromotion that causes pain and, over time, hardware stress fractures.
The critical point: pseudarthrosis does not show up on plain X-rays. The spine looks fused, the hardware looks intact, and the curve looks corrected. Only a CT scan with fine cuts through the fusion mass reveals whether true bony union has occurred. Patients who have been told for years that their X-rays look fine, but who have never had a dedicated fusion CT, have not been adequately evaluated for pseudarthrosis.
Flatback Deformity — Loss of Lumbar Lordosis
The lumbar spine needs a normal inward curve — lordosis — to place the body’s center of gravity over the pelvis. When a long-segment fusion leaves the lumbar spine flat or straightened, the patient must compensate by bending their knees, tilting their pelvis backward, and extending their hips just to stay upright. This compensation is exhausting. It works for a while, then it stops working well enough.
Flatback deformity was the defining complication of Harrington rod surgery from the 1960s through the 1980s — those rods corrected the scoliosis curve but simultaneously eliminated lumbar lordosis. But it is not only a Harrington rod problem. Any long-segment lumbar fusion that inadequately restores lordosis can produce flatback syndrome over time, including modern surgeries performed with pedicle screws. The progressive forward lean, the bent-knee posture, and the inability to stand for more than a few minutes are its hallmarks. Many patients with this pattern have been told they are simply getting older.
Adjacent Segment Disease
A long spinal fusion places increased mechanical stress on the discs and joints immediately above and below the fused segment. Over years and decades, this accelerated wear produces degeneration at those adjacent levels — disc collapse, facet arthritis, stenosis, nerve compression — that was not present at the time of the original surgery. Adjacent segment disease manifests as new back pain, new leg pain, neurological symptoms, or some combination, typically developing 5 to 15 years after the index procedure.
Proximal Junctional Kyphosis
Proximal junctional kyphosis (PJK) refers to new kyphotic angulation at the vertebral levels immediately above the top of the fusion construct. When the fusion ends and the mobile spine resumes, the segment at the junction between the two — the mobile segment right above the top screw — experiences concentrated stress that can lead to progressive kyphosis over time. Mild PJK is common after long-segment fusion and is often asymptomatic. When it is significant — producing pain, deformity visible to the patient, or neurological compromise — it requires evaluation and sometimes surgical correction.
Reference: Sardar ZM, Kim Y, Lafage V, et al. State of the art: proximal junctional kyphosis — diagnosis, management and prevention. Spine Deform. 2021;9(3):635–644. PMID 33452631
Adding-On — Curve Progression Below the Fusion
The fusion corrected and stabilized the surgical levels. But the lumbar segments below the fusion remained mobile, and if the fusion endpoint was not chosen to include the full structural component of the curve, those unfused segments can develop progressive curvature over time. This is called adding-on, and it can occur years after what was technically a successful surgery. The original curve is stable within the fusion, but the spine below it curves progressively — reproducing the cosmetic and functional problems the surgery was intended to address.
Hardware Failure
Rods and screws are designed for long-term durability, but they are not permanent. A broken rod is almost always the mechanical consequence of an underlying pseudarthrosis at that level — the rod is absorbing cyclic loading that solid fusion bone should be absorbing instead, and eventually it fails from metal fatigue. A broken rod is therefore not just a hardware problem; it is a signal to look carefully for pseudarthrosis at that level. Other hardware events — loose screws, hook migration, implant prominence — can also develop years after surgery and may require evaluation.
Why “Your X-Rays Look Fine” Is Not the Complete Answer
Plain X-rays are the most commonly used surveillance tool after scoliosis surgery — but they are poorly suited to detecting most of the failure patterns described above. They show hardware position and gross alignment, but they do not show:
- Whether the fusion mass is solid (CT required to diagnose pseudarthrosis)
- Whether disc levels above or below are degenerating (MRI required)
- Whether nerves are being compressed by adjacent segment disease (MRI required)
- Whether global sagittal balance is maintained (full-length standing 36-inch X-ray required, not a spot X-ray of the fusion)
A patient who is symptomatic years after scoliosis surgery and whose most recent evaluation consisted of a spot AP and lateral X-ray — which showed intact hardware and no gross deformity — has not been evaluated for the problems most likely to be causing their symptoms. The workup that is actually indicated typically includes a full-length standing X-ray series, a CT scan of the fusion, and an MRI of the entire spinal axis.
What a Proper Evaluation Involves
When a patient presents to Dr. Sardar with new or worsening symptoms after prior scoliosis surgery, the evaluation is comprehensive and imaging-led. It typically includes:
- Prior operative reports — knowing what was done at the index surgery (levels fused, hardware used, complications noted, alignment achieved) provides essential context for interpreting current imaging
- Serial X-rays over time — comparison of current imaging with immediate postoperative films reveals how much has changed since surgery
- Full-length standing X-ray series — the 36-inch cassette that shows the entire spine and pelvis in a single standing image, allowing measurement of global sagittal balance (SVA), lumbar lordosis, pelvic tilt, and coronal alignment. This single study often reveals the problem that standard X-rays have been missing for years
- CT scan of the fusion — fine-cut sequences through the fusion mass to evaluate for pseudarthrosis, hardware integrity, and bony anatomy available for revision instrumentation
- MRI — to evaluate disc levels above and below the fusion, neural compression, spinal cord signal, and the condition of the unfused segments
- Bone density assessment — particularly relevant for patients in their 50s and 60s, as osteoporosis significantly affects revision surgical planning and outcomes
The output of this evaluation is a clear, evidence-based picture of what is actually happening. Not reassurance without data. Not a recommendation to “give it more time.” A specific diagnosis, a specific explanation of why you are experiencing what you are experiencing, and an honest discussion of what surgical and non-surgical options are available for your specific situation.
When Surgery Is and Isn’t the Answer
Not every patient with late deterioration after scoliosis surgery needs another operation. Some findings — a small amount of adjacent segment degeneration causing manageable pain, a mild PJK without neurological involvement — are best managed conservatively with physical therapy, pain management, or close monitoring. Revision surgery is major surgery, and it is not recommended unless the clinical picture strongly supports it.
What revision surgery is appropriate for includes: pseudarthrosis with persistent pain and hardware failure, significant flatback deformity causing progressive functional decline, symptomatic adjacent segment disease with neurological compression, and significant adding-on or junctional failure that is progressing. For patients with these specific findings, revision surgery at a high-volume deformity center offers the realistic prospect of meaningful, durable improvement.
The important thing is not to accept deterioration as inevitable without understanding its specific cause. “Nothing more can be done” is among the most common things patients with late scoliosis surgery complications have been told before arriving at NewYork-Presbyterian / Columbia University for evaluation. In many of those cases, something more can be done — but it requires a surgeon and a center with specific expertise in exactly this kind of problem.
Practical Steps If You’re In This Situation
- Gather your prior records. If at all possible, locate your original operative report, your immediate postoperative X-rays, and any imaging you have had since. If records are old and hard to find, contact the hospital where the original surgery was performed — they may still have imaging archived.
- Get a full-length standing X-ray. If you have not had a 36-inch scoliosis series recently, request one before or at your evaluation. This single study provides information that is simply not available from standard X-rays.
- Consider requesting a CT of your fusion. If you have had persistent pain after scoliosis surgery and have never had a fine-cut CT of the fusion mass, ask about this specifically at your next evaluation. It is the gold standard for diagnosing or excluding pseudarthrosis.
- Seek an independent second opinion at a dedicated deformity center. The surgeons best positioned to evaluate late complications of scoliosis surgery are those who see many of these patients routinely — at high-volume academic centers where complex revision is a core part of the practice, not an occasional event.
For an overview of the specific failure patterns covered in this post — pseudarthrosis, hardware failure, imbalance, and adding-on — and what revision surgery involves, see the When Scoliosis Surgery Doesn’t Go As Planned page. For patients with flatback and loss of lumbar lordosis, see Flatback Deformity Surgery. For patients with prior Harrington rod instrumentation specifically, see Harrington Rod Revision Surgery.
About Dr. Zeeshan Sardar
Dr. Sardar, MD, MSc, F.R.C.S.C, is Co-Chief of Spinal Deformity Surgery at NewYork-Presbyterian / Columbia University. A significant portion of his practice consists of revision and re-revision cases referred from surgeons and institutions across the country, including many patients who have been told nothing more can be done. To schedule a consultation or telemedicine visit, call 212-932-5187 or visit the contact page. Telemedicine available in NY, NJ, CT, FL, PA, MO, CA, and TX.
This post is for educational purposes only and does not constitute individualized medical advice. Please consult a qualified spine specialist to discuss your specific situation.