Spondylolisthesis Surgery
Short answer. When spondylolisthesis causes leg pain or walking limits that don't improve with non-surgical care, surgery usually helps, and most patients report meaningful improvement. For the common degenerative type, recent large trials found that removing pressure on the nerves without fusion often works as well as adding a fusion. It also means a shorter operation and hospital stay.
What is spondylolisthesis, and how is it graded?
Spondylolisthesis means one vertebra has slipped forward on the one below it. Severity is graded by how far it has slipped:
- Grade I: up to 25%
- Grade II: 25–50%
- Grades III–V: more than 50%
Most degenerative slips are Grade I. A 2024 review co-authored by Dr. Diebo argues that grade alone is not enough to guide treatment. Overall spinal alignment, pelvic shape, and whether the slip moves when you bend also matter.
Is surgery better than non-surgical treatment?
For people with persistent symptoms, the evidence favors surgery. In the large SPORT study, patients who had surgery improved much more in pain and function than those treated without surgery, and the benefit lasted through eight years.
Do I need a fusion?
It depends. Three major trials compared decompression alone with decompression plus fusion:
| Trial | Patients | Main finding |
|---|---|---|
| SLIP (NEJM 2016) | 66, stable Grade I | Fusion gave slightly better physical-health scores; reoperations 14% with fusion vs 34% without |
| Swedish Spinal Stenosis Study (NEJM 2016) | 247 (135 with a slip) | No difference in disability; fusion meant longer hospital stays (7.4 vs 4.1 days) |
| NORDSTEN-DS (NEJM 2021; BMJ 2024) | 267, slip ≥3 mm | Decompression alone was as good as fusion at 2 and 5 years; reoperations 16% vs 18% |
A fusion may still be the better choice in some situations. These include a slip that moves on bending X-rays, an isthmic (stress-fracture) slip, a high-grade slip, or a slip that is part of a larger deformity. For me, fusion is the last resort. I consider it when there is instability, or when the low back has lost its natural curve.
What is the success rate?
In NORDSTEN-DS, about 71–73% of patients improved their disability score by at least 30% at two years, with or without fusion. At five years, 63% of patients in both groups had kept that level of improvement. In another long-term study, more than 80% of patients said surgery had helped them.
How long is recovery?
- Hospital stay: about 3 days after decompression alone, and about 5 days with fusion (NORDSTEN-DS)
- Leg pain: often improves within six weeks
- Maximum improvement: usually around one year
- Non-contact sports: often 3–6 months after fusion
When to see a specialist. If leg pain or walking limits persist despite therapy, request an appointment.
Sources
- Daher, M., et al., including Bassel G. Diebo. "Lumbar Spondylolisthesis Grading: Current Standards and Important Factors to Consider for Management." World Neurosurgery, 2024. PMID 39094941.
- Ghogawala, Zoher, et al. "Laminectomy plus Fusion versus Laminectomy Alone for Lumbar Spondylolisthesis." New England Journal of Medicine, 2016. doi:10.1056/NEJMoa1508788.
- Försth, Peter, et al. "A Randomized, Controlled Trial of Fusion Surgery for Lumbar Spinal Stenosis." New England Journal of Medicine, 2016. doi:10.1056/NEJMoa1513721.
- Austevoll, Ivar M., et al. "Decompression with or without Fusion in Degenerative Lumbar Spondylolisthesis." New England Journal of Medicine, 2021. doi:10.1056/NEJMoa2100990.
- Kgomotso, E. L., et al. "Decompression Alone or With Fusion for Degenerative Lumbar Spondylolisthesis (Nordsten-DS): Five Year Follow-Up." BMJ, 2024. doi:10.1136/bmj-2024-079771. PMID 39111800.
More background: Scoliosis Research Society patient information srs.org.