A Modic change on an MRI report describes a pattern in the bone marrow beside a disc’s endplate. “Type 1” means dark on T1 and bright on T2 images, an oedema-like pattern. The words describe what the scan shows. On their own, they do not establish the cause of your pain or a need for surgery. Modic · 1988 Herlin · 2018

Decode the language

Report phrase What it is describing What it does not establish
“Modic Type 1 endplate changes” A low-T1, high-T2 marrow pattern beside an endplate That this is definitely your pain source
“Reactive marrow change” A descriptive signal response in bone marrow A specific cause by itself
“Degenerative endplate change” Change at the interface between disc and vertebra A need for surgery
“Endplate oedema” An oedema-like marrow signal near the endplate Infection by itself
“Fatty endplate change” A fatty marrow pattern, often Type 2 A severity score
“At L4–L5” The disc level between the fourth and fifth lumbar vertebrae An exact map of where you feel pain

The full report matters. These phrases may be used alongside disc, facet, canal and nerve-root findings. Modic · 1988 Herlin · 2018

Why T1, T2 and STIR differ

MRI sequences emphasise different tissue properties. Type 1 looks dark on T1 and bright on T2. Fat-suppressed T2 or STIR helps make oedema-like signal visible while reducing fat signal. A clinician or radiologist interprets the combination, not a single bright patch. Herlin · 2018

Illustrative L4–L5 spinal segment with a Modic change shown as a coloured band in the marrow beside the facing endplates.

Symptoms that need a different conversation

Seek emergency assessment for new bladder or bowel control changes, loss of feeling around the genitals or bottom, or significant new weakness with back pain. These can be signs of cauda equina compression. Do not wait for a Modic appointment. NHS · 2025

Fever or feeling systemically unwell with back pain, or a history suggesting infection or inflammatory back disease, needs clinical assessment. Modic is not a label that rules out other conditions. NICE · 2016

Six questions to take with you.

You do not need to understand every technical term before your appointment.

  1. Where are the changes, and which MRI sequences show them?
  2. What makes you think they do, or do not, explain my pain?
  3. What other possible pain sources have you considered?
  4. What is a realistic plan for conservative care, and how will we review progress?
  5. For any proposed treatment, how closely do I match the people in its trials?
  6. What are the benefits, harms, alternatives, costs and reasons it might not help?
A useful next stepLook at the treatment evidence →