Spondylolisthesis

3 things to know first

1. It is a position change in the spine. It is not the same as a slipped or herniated disc.
2. Many people have few symptoms. The degree of slippage and whether nerves are crowded matter more than the word alone.
3. The report should name a level. For example, L4–L5 tells you which bones are involved.

What it is

Spondylolisthesis means one vertebra has moved out of alignment relative to the vertebra beneath it, usually forward. It can occur with age-related joint and disc changes or with a small defect in part of the vertebra. Reports may use “anterolisthesis” for forward slippage and give a measurement or grade.

Why it appears on your report

X-rays show alignment and may be taken in standing or different positions. MRI shows whether the spinal canal or nerve openings are narrowed and can assess discs and nerves. CT gives detailed information about bone. The radiologist records the level, direction, and degree of slippage.

How serious is it

Some people have no pain. Others have back pain or symptoms travelling into a leg if a nerve is irritated. A larger shift does not always mean worse symptoms. Your clinician will compare the scan with examination findings and the course of your symptoms.

When to seek care urgently

Get urgent help for new loss of bladder or bowel control, numbness around the groin, or rapidly worsening leg weakness. These symptoms need assessment regardless of the reported grade.

What usually happens next

1. Match the imaging level with the location of pain or numbness.
2. Review whether the report describes nerve compression or spinal stenosis.
3. Discuss rehabilitation and follow-up; specialist review may be appropriate for persistent or progressive symptoms.

A simple analogy

A spine is a stack of blocks. In spondylolisthesis, one block has slid a little relative to the block underneath; whether the nearby cables are squeezed matters.

Further reading

• NHS — Spondylolisthesis
• RadiologyInfo — Spine MRI