Spondylolisthesis Statistics (2026): Types, Prevalence, and Age
Spondylolisthesis, when one vertebra slips forward over the one below it, comes in two very different forms with very different profiles. Isthmic spondylolisthesis affects young and middle-aged adults, while degenerative spondylolisthesis strikes older women three times as often as men. Most cases are mild and manageable. Here is the 2026 data on both types, from primary sources only.
- Isthmic spondylolisthesis affects about 4% to 8% of adults.
- Spondylolysis, the pars defect that can precede it, is found in 5% to 11.5% of adults.
- Degenerative spondylolisthesis has a strong female skew: 8.4% in women vs. 2.7% in men.
- The Framingham Study found a male-to-female ratio of about 1:3 for the degenerative type.
- Isthmic favors L5-S1; degenerative favors L4-L5.
- Grade I (mild) slippage accounts for about 75% of all cases.
- In one study, no isthmic patients had needed fusion surgery, indicating most cases aren't severely disabling.
What's in This Guide
1 Two Conditions, One Name
The single most useful thing to understand about spondylolisthesis is that the word covers several distinct conditions. The two most common, isthmic and degenerative, differ in cause, age, sex, and location.
Spondylolisthesis is driven by a combination of biomechanical stress, degenerative change, and, less often, congenital abnormalities. Isthmic spondylolisthesis arises from a defect in the pars interarticularis, a small bridge of bone in the vertebra, while degenerative spondylolisthesis results from wear and tear in the intervertebral discs and facet joints that gradually destabilizes the segment. Because these two types affect such different populations, they are best understood separately. This is one of the structural conditions we cover in our data on the lower back pain causes.
Source: StatPearls (Spondylolisthesis)
Explore the conditions we treat2 Isthmic Spondylolisthesis
The isthmic type has its roots in a stress fracture of the pars interarticularis, often acquired years before any symptoms appear.
Isthmic spondylolisthesis is observed in approximately 4% to 8% of individuals, and spondylolysis, the pars stress fracture that can precede it, ranges from 5% to 11.5% in the general adult population. It is more common in males and frequently involves the L5-S1 level. The underlying pars defect often begins in adolescence, particularly in young athletes in sports involving repeated back extension, and may go unrecognized until symptoms develop in adulthood, if they ever do. Importantly, one study found that when spondylolysis is present, spondylolisthesis is far more likely to follow.
Source: StatPearls (Spondylolisthesis) | Scientific Reports (spondylolysis progression, 2020)
Learn about diagnostic nerve testing3 Degenerative Spondylolisthesis
The degenerative type tells a completely different story, one of gradual wear over decades, with a striking demographic pattern.
Degenerative spondylolisthesis predominantly affects older adults, with a marked predilection for females. A large cross-sectional survey of over 4,000 patients reported a prevalence of 2.7% in men and 8.4% in women, and the Framingham Study found a male-to-female ratio of about 1:3, with prevalence rising steadily from the fifth through the eighth decades of life. It most commonly occurs at the L4-L5 level. Because this type stems from the same degenerative changes that narrow the spinal canal, it frequently coexists with, and can contribute to, our spinal stenosis statistics.
Degenerative Spondylolisthesis Prevalence by Sex
Source: StatPearls (Spondylolisthesis) | Lumbar degenerative spondylolisthesis epidemiology (systematic review)
Meet Dr. Greenwald: spine surgeon and neurosurgeon4 Grading and Severity
How far the vertebra has slipped is measured by grade, and the data here are reassuring: the mildest form is by far the most common.
Spondylolisthesis is graded by the percentage of forward slippage, with Grade I representing up to 25%. Grade I accounts for about 75% of all cases, meaning the large majority involve only mild slippage. Most low-grade cases are stable and do not progress significantly over time. This is one reason spondylolisthesis, though it sounds alarming, is often managed conservatively and monitored rather than treated aggressively.
Myth: "Spondylolisthesis means my spine is unstable and I need surgery."
For most people, no. About 75% of cases are the mildest grade, many cause no symptoms at all, and in one study none of the patients with isthmic spondylolisthesis had required fusion surgery. A slipped vertebra on an X-ray is common and often stable. The decision to treat, and how, depends on symptoms, grade, and whether nerves are being compressed, not on the diagnosis alone. The word sounds severe; most cases are not.
Source: StatPearls (Spondylolisthesis)
See conservative, non-invasive care options5 The Link to Back Pain
Like other structural spine findings, spondylolisthesis is associated with back pain, but the relationship is looser than the diagnosis might suggest.
The Framingham-based community study found that spondylolysis and spondylolisthesis are prevalent in the general population, but the relationship between these findings and low back pain remains debated: about 20% of those studied reported significant low back pain. As with disc degeneration and stenosis, this means a slipped vertebra seen on imaging is not automatically the source of a person's pain. The clinical picture, symptoms, examination, and how the pain behaves, matters more than the label. For the broader breakdown of what actually causes back pain, see our causes of back pain data.
Source: The Spine Journal (882-patient CT study)
Explore interventional pain management6 Treatment and Outlook
The statistics point toward a measured, conservative-first approach for most people with spondylolisthesis.
Most spondylolisthesis is managed with conservative care, including targeted rehabilitation, activity modification, and interventional pain options when needed. Surgery is reserved for cases with persistent, severe, or progressive symptoms, or higher-grade slippage causing nerve compression, and typically aims to decompress the affected nerves and stabilize the segment. Because degenerative spondylolisthesis so often accompanies spinal stenosis, treatment decisions must account for both. A surgeon who is both a spine surgeon and a neurosurgeon is well positioned to weigh the full picture and reserve surgery for those most likely to benefit.
Desert Spine and Pain Analysis: Two Patients, One Diagnosis
Spondylolisthesis illustrates why a diagnosis alone rarely tells the story. The same word describes a 20-year-old athlete with an L5-S1 pars slip and an 75-year-old woman with L4-L5 degenerative slippage, two entirely different situations with different causes, risks, and treatments. Add the fact that about 75% of cases are low-grade and many are painless, and the lesson is clear: effective care starts by identifying which type, which grade, and which symptoms are actually present, not by reacting to the term itself.
Interpretation of the isthmic-versus-degenerative demographic split alongside the Grade I predominance. Calculation and interpretation original to Desert Spine and Pain. Sources: StatPearls; Framingham Study.
Source: StatPearls (Spondylolisthesis)
Book a consultation: (602) 566-95007 Every Statistic in One Table
| Statistic | Figure | Source | Year |
|---|---|---|---|
| Isthmic spondylolisthesis, adults | 4–8% | StatPearls | 2025 |
| Spondylolysis (pars defect), adults | 5–11.5% | StatPearls | 2025 |
| Degenerative spondylolisthesis, women | 8.4% | StatPearls (survey) | 2025 |
| Degenerative spondylolisthesis, men | 2.7% | StatPearls (survey) | 2025 |
| Degenerative type male-to-female ratio | ~1:3 | Framingham Study | 2009 |
| Isthmic most common level | L5-S1 | StatPearls | 2025 |
| Degenerative most common level | L4-L5 | StatPearls | 2025 |
| L5-S1 isthmic prevalence (CT study) | 3.7% | The Spine Journal | 2019 |
| L5-S1 degenerative prevalence (CT study) | 8.3% | The Spine Journal | 2019 |
| L4-L5 degenerative prevalence (CT study) | 12% | The Spine Journal | 2019 |
| Grade I (mild) share of all cases | ~75% | StatPearls / Meyerding | 2025 |
| Spondylolysis with resulting slippage | 51.4% | Scientific Reports | 2020 |
| Bilateral spondylolysis 60+ with slippage | 90% | Scientific Reports | 2020 |
| Those with findings reporting significant LBP | ~20% | Framingham community study | 2009 |
| Isthmic patients needing fusion (one study) | None | Scientific Reports | 2020 |
| Degenerative prevalence trend with age | Rises 5th–8th decade | Framingham Study | 2009 |
Frequently Asked Questions
How common is spondylolisthesis?
What is the difference between isthmic and degenerative spondylolisthesis?
Who gets degenerative spondylolisthesis?
How serious is spondylolisthesis?
Does spondylolisthesis require surgery?
Methodology and Sources
Every statistic in this article is drawn from a Tier 1 primary source: a peer-reviewed study, a major cohort like the Framingham Study, or an established medical reference. No blog-to-blog citations are used. Isthmic and degenerative spondylolisthesis are reported separately because they differ substantially in cause and demographics.
Primary sources:
- StatPearls (NCBI Bookshelf): type-specific prevalence, sex and age patterns, levels, and grading.
- Framingham Heart Study (community CT project): degenerative prevalence, sex ratio, age trend, and the pain association.
- The Spine Journal (882-patient CT study): level-specific prevalence of isthmic and degenerative types.
- Scientific Reports (2020): spondylolysis-to-spondylolisthesis progression and surgical rates.
- Peer-reviewed systematic review: gender- and age-specific degenerative prevalence.
This article is for general educational purposes and is not individual medical advice. Statistics describe populations, not any one person. Imaging findings must be interpreted with symptoms. If you have back or leg pain with weakness, numbness, or changes in bladder or bowel function, seek evaluation.
Media and press: Journalists and researchers are welcome to cite these statistics with attribution to the original primary source named alongside each figure, and a link to this page as the compiled reference. For commentary from a board-certified spine surgeon and neurosurgeon, contact Desert Spine and Pain in Phoenix, Arizona at (602) 566-9500.
