Understanding Your Lumbar Spine MRI Results
Your MRI shows age-related wear and tear in your lower back with two specific areas where nerves are being pinched—one on the right side at L3-L4 and one on the left side at L5-S1—which likely explains your back pain.
What the Main Findings Mean
The Spine Discs (Your Shock Absorbers)
Think of the discs between your vertebrae (back bones) as jelly donuts that cushion your spine. Your MRI shows these discs are:
- Drying out and losing height at L5-S1 (the lowest disc in your back)—like a sponge that's been left out and shrunk
- Bulging outward at multiple levels (L2-L3, L3-L4, L4-L5, and L5-S1)—imagine squeezing that jelly donut so the filling pushes out to the sides
The Slippage Problem (Retrolisthesis)
Grade 1 retrolisthesis at L5-S1 means your L5 vertebra has slipped slightly backward on the S1 bone below it. Research shows this finding is present in about 23% of people with disc problems and, importantly, doesn't necessarily predict worse pain or function 1. The slippage itself may not be causing your symptoms—the nerve pinching is more concerning.
The Critical Issues: Nerve Compression
Your MRI identified two areas where nerves are being squeezed 2:
Right L3-L4 level: Moderate narrowing of the tunnel where the right L3 nerve exits, with the nerve being encroached upon
- This can cause pain, numbness, or weakness radiating down the front/side of your right thigh
Left L5-S1 level: Moderate narrowing of the tunnel where the left L5 nerve exits, with encroachment of that nerve
- This can cause pain, numbness, or weakness radiating down your left buttock, outer leg, and top of foot
Additional Degenerative Changes
- Facet arthropathy: Arthritis in the small joints at the back of your spine at L4-L5 and L5-S1—like arthritis in any other joint
- Mild spinal canal narrowing at L4-L5: The main tunnel for nerves is slightly narrowed but not severely
What This Means Clinically
The MRI confirms multilevel degenerative disc disease—essentially arthritis of the spine that develops over time from normal aging, genetics, and mechanical stress 3, 4. The most clinically significant findings are the moderate foraminal stenosis (nerve tunnel narrowing) at two levels 5.
Research shows that while disc abnormalities are common even in people without symptoms, when you have back pain with nerve-related symptoms (like leg pain, numbness, or weakness), the MRI findings of nerve compression are more likely to be the actual cause 2.
Important Context
- These findings are common: Disc bulges and degeneration increase with age and are found in many people without pain 2
- The nerve compression matters most: The moderate foraminal narrowing at L3-L4 and L5-S1 with nerve encroachment is what likely correlates with your symptoms
- No emergency findings: Your spinal cord is normal, there's no fracture, and no signs of the serious condition called cauda equina syndrome 2
What Typically Happens Next
Your doctor will correlate these MRI findings with your specific symptoms (where you feel pain, numbness, or weakness). If conservative treatment (physical therapy, medications, injections) hasn't worked after 6 weeks and your symptoms match these MRI findings, you may be a candidate for surgical or interventional procedures 2.
The good news is that your MRI provides a clear roadmap of what's happening structurally, allowing your medical team to target treatment to the specific levels causing problems.