Does a meniscus tear on my MRI mean I need surgery?

Not necessarily. Many meniscus tears, especially age-related ones, are managed without surgery. Your doctor weighs your symptoms, activity, and exam — not the images alone — when discussing options.

What is a bone bruise on a knee MRI?

Bone marrow edema, sometimes called a bone bruise, is a bright area in the bone that often follows an impact or stress. Many heal over time. Your doctor interprets it alongside your history.

Is a Baker’s cyst behind my knee dangerous?

Baker’s cysts are common and usually harmless, often related to extra fluid in the joint. Your doctor can explain whether it needs any attention in your case.

MRI · Knee

Knee MRI, Explained

A knee MRI makes detailed pictures of the soft tissues and bones inside your knee — the cartilage, ligaments, tendons, and menisci. This page explains what it looks at and what common report terms mean.

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What this scan shows

A knee MRI is very good at showing soft tissues that X-rays cannot, including the menisci (the knee’s cushions), the major ligaments, the tendons, the joint cartilage, and the bones. Doctors order it after an injury, for pain, swelling, locking, or instability, or to plan treatment. Some findings, like mild wear, are common with age and may not be the source of symptoms — your doctor connects the images to your exam.

Common findings, in plain words

Meniscus tear

A tear in one of the C-shaped cushions in the knee. Tears range widely, and some — especially age-related ones — cause few or no symptoms. Your doctor considers whether it explains what you feel.

ACL or other ligament sprain/tear

A stretch or tear of one of the knee’s stabilizing ligaments. The report describes the extent so your doctor can discuss stability and options.

Cartilage thinning (chondromalacia)

Softening or thinning of the smooth cartilage on the joint surfaces. It is common with age and activity and is graded by degree.

Joint effusion

Extra fluid within the knee joint, often a sign of irritation or a recent injury. It frequently settles as things calm down.

Bone marrow edema (bone bruise)

A bright area within the bone that often reflects a bruise or stress response. Many resolve over time. Your doctor interprets it with your history.

Baker’s cyst

A fluid-filled sac behind the knee. It is common, often harmless, and usually related to fluid in the joint.

Terms you might see

Meniscus: One of two crescent-shaped cushions of cartilage that pad and stabilize the knee joint.
Ligament: A band of tissue that connects bone to bone and helps keep the knee stable — for example the ACL.
Cartilage: The smooth, slippery surface covering the ends of bones so they glide easily in the joint.
Effusion: Extra fluid inside a joint, often described when there is swelling or irritation.
Edema: Fluid or swelling within tissue that shows up as a brighter area on certain MRI images.

Questions to ask your doctor

1.Do the MRI findings explain the pain, swelling, or instability I feel?
2.Is any finding likely age-related rather than from a recent injury?
3.What are my treatment options, including non-surgical ones?
4.Would physical therapy help before considering other steps?
5.Do I need any follow-up, and when should I check back?

See these findings on your own scan

Upload your scan (de-identified in your browser) and AI explains it in plain language, with every finding shown on the images. Your first AI report is free — no card needed. Informational only — not a diagnosis.