Spondylolisthesis
Read Your Scan Editorial Team·Last updated
Written from published radiology references and reviewed for plain language. Not written or signed by a physician, and not a diagnosis. How we write these pages →
In plain language
One vertebra sitting slightly forward or backward relative to the one below. It is often mild and stable. The report grades it so your doctor can gauge its significance.
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Where you'll see this
This wording turns up on Lumbar Spine MRI reports — MRI imaging of the spine. A lumbar (low-back) MRI shows the vertebrae, the cushioning discs between them, the spinal canal, and the nerves that travel to the legs. Doctors order it for low-back pain, sciatica, leg numbness or weakness, or to plan care. Importantly, many of the changes it describes are extremely common and are seen in people with no pain at all — so the report is read together with how you actually feel.
Questions worth asking your doctor
- Do the findings on the MRI match where I actually feel pain or symptoms?
- Are these changes common for my age, or is anything unusual?
- What are my non-surgical options, such as physical therapy?
- Are there any signs that would mean I should seek care sooner?
- Do I need any follow-up imaging, and when?
How common is this?
Spondylolisthesis — one vertebra slipping forward relative to the one below it — is fairly common. The degenerative form affects up to 1 in 10 adults over 60, most often at the L4-L5 level, while a different type (isthmic, from a small stress fracture) shows up in around 5-6% of the general population, often first noticed in adolescence or young adulthood.
When should I worry?
Most low-grade slips (grade I, less than 25% slippage) cause no symptoms and are found incidentally. Concern increases with a higher-grade slip, a slip that is clearly progressing on repeat imaging, or new nerve-related symptoms like leg pain, numbness, or weakness — and any loss of bladder or bowel control needs urgent evaluation.
What happens next
Spondylolisthesis is graded I through IV by how far the vertebra has slipped. Most low-to-moderate grade cases are managed with physical therapy, core-strengthening exercise, and activity modification. Surgery, usually a spinal fusion, is reserved for high-grade slips, progressive slippage, or cases with significant nerve compression that doesn't respond to conservative care.
Frequently asked questions
- Do I need surgery for spondylolisthesis?
- Not usually. Most cases, especially low-grade ones, respond well to physical therapy and activity changes, and surgery is only considered for higher-grade or progressive slips or significant nerve symptoms.
- Will the vertebra keep slipping further?
- In adults, most low-grade degenerative slips are stable and progress very slowly if at all; your doctor may recommend a follow-up scan to check for progression if there's any doubt.
- Can I still exercise with this diagnosis?
- Yes, and it's usually recommended — core-strengthening and low-impact exercise are a mainstay of treatment, though your doctor or physical therapist may suggest avoiding activities that cause spine hyperextension.
Other words on the same report
Where this word comes up
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