Most people read their knee MRI report in a parking lot or waiting room, even before their clinic visit. The patient portal notification arrives, the report opens on your phone, and the words that register first can be alarming. Degeneration. Complex tearing. Maybe even bone-on-bone.
By the time some patients reach my office, they’ve already decided they need surgery.
Let’s slow that down.
I’m Cory Calendine, an orthopedic surgeon in Franklin, Tennessee. I specialize in hip and knee replacement and have the opportunity to review these reports daily. Here is what I want you to know about the MRI report on your screen.
Why your knee MRI report reads like a foreign language
Having your own records is a good thing. You should be able to read anything in your chart, this report included. The problem isn’t access. The problem is the audience.
A knee MRI report is written by a radiologist for the physician who ordered the scan, in the shorthand two specialists use with each other. Nothing in it is aimed at you.
That’s why it lands so heavily. A report can list eight findings, and none may be why your knee hurts.
A study published in August 2026 found that 68.6 percent of adults with portal access read test results before hearing from anyone on their care team. Roughly one in fifteen didn’t really understand what they read.
My goal isn’t to turn you into a radiologist. It’s to make the words mean something before your appointment. RadiologyInfo keeps a useful plain-language primer too.
What a knee MRI is actually looking at
An MRI cuts a three-dimensional picture of the knee into thin slices from three directions. Your report may name all three.
- Sagittal: the side view. Best look at the cruciate ligaments and the meniscus.
- Coronal: the front view. Where the collateral ligaments and the inner and outer compartments show up.
- Axial: the top-down view. The kneecap (patella) and the groove it rides in.
Each slice is only a few millimeters thick, which is why a finding on two neighboring slices carries more weight than a bright spot on one. I covered what a knee MRI is like separately.
Why some structures look white and others look black
Different sequences make different tissues bright. On T1 images, fat and bone marrow glow white. On fluid-sensitive sequences, water glows white instead.
Healthy ligaments and tendons stay dark, and a healthy meniscus is a dark triangle between the bones.
So when a report mentions increased signal, something that should look dark is showing brightness. That brightness is fluid or changed tissue. Whether it explains your symptoms is a separate question.
7 essential terms in your knee MRI report, translated
The words patients ask me about most, plain meaning first.
1. Degenerative changes
Tissue that is worn, aged, or matured. That’s all. It’s a description, not a diagnosis, and it appears in a large share of reports after age 40. It often has nothing to do with the pain that sent you for the scan.
2. Signal change, and why it’s graded 1, 2, or 3
Radiologists grade brightness inside the meniscus on a three-point scale. The grade matters far more than the word tear.
- Grade 1: a small round bright spot that does not reach the surface. Usually not a true tear.
- Grade 2: a bright line that still does not reach the surface. Usually age-related.
- Grade 3: brightness that extends to the surface. This one is a true tear.
Grades 1 and 2 rarely need anything done. If your report stops short of grade 3, notice that before planning an operation.
3. Effusion
Extra fluid inside the joint. A knee makes more when it’s irritated, whether from arthritis, injury, or inflammation.
An effusion tells me the knee is unhappy. It doesn’t tell me why. A large or stubborn one is sometimes drained and tested.
4. Bone marrow edema, also called a bone bruise
Swelling inside the bone itself, seen as brightness on fluid-sensitive images. The hard outer shell is intact, so this is not a fracture.
Bone bruises follow impact and usually settle over weeks to months. In an arthritic knee, they appear where the bone carries more load than it should.
5. Chondromalacia and cartilage thinning
Chondromalacia means softened or roughened cartilage. Thinning means there’s less of it than there used to be.
Cartilage loss is graded 1 through 4, with grade 4 meaning it’s gone to bare bone. Grade 4 in a weight-bearing area tracks most closely with arthritis pain.
6. Osteophytes, or bone spurs
Extra bone that builds along the edges of a joint that has lost cartilage. Spurs are a response to changed loading, not a disease of their own. They tell me arthritis has been around a while and almost never need removing by themselves.
7. Baker’s cyst, or popliteal cyst
A fluid-filled pouch behind the knee, formed when the joint makes extra fluid that works its way backward into a pocket. It is nearly always a symptom of something else inside the knee, so treating the cyst without treating the cause usually brings it right back.
The most important thing a knee MRI report cannot tell you
Here’s the part patients are rarely told.
A finding can be completely true and still not be the cause of your pain.
Your report can accurately describe degeneration in a tendon nowhere near the spot that hurts. Both things are true at once.
The numbers are striking. In a study of 991 adults aged 50 to 90, 61 percent of those found to have a meniscal tear on MRI had no knee pain, aching, or stiffness in the previous month.
Cartilage tells the same story. A pooled analysis of 63 studies covering more than 5,000 knees found cartilage defects in 43 percent of pain-free adults over 40.
So a tear doesn’t mean the tear is your problem. Degenerative tearing usually means softening: tissue on its way toward a tear, not a fresh injury. The American Academy of Orthopaedic Surgeons explains how tears are graded and treated.
This is the part that gets under my skin. Patients sometimes arrive having been told, on the strength of a report alone, that they need an operation.
That usually comes from someone outside orthopedics who is trying to help. But a report read without the person attached to it can send you down the wrong path.
Your story comes first. What hurts, when it hurts, and what you can’t do anymore. Then we match the picture to the story, never the other way around.
Why I often want a standing X-ray more than an MRI
This surprises people. For hip and knee arthritis, an MRI usually isn’t the test I want most.
I want weight-bearing knee X-rays. You standing up, your body weight running through the joint.
I’m not looking at the bone. I’m looking at the space between the bones. Cartilage doesn’t show up on an X-ray, but the gap it holds open does.
Think of it like tread on a tire. As cartilage wears, that gap narrows. When it closes, the bones touch, and that is exactly what bone on bone means.
An MRI taken lying down can’t show me that, because nothing is loading the joint. A standing X-ray can, which is why an MRI often doesn’t change the arthritis plan at first. I compare X-ray, CT, and MRI elsewhere.
What to do with the knee MRI report in your hand
Bring it. Absolutely bring it. Just don’t let it decide anything before your appointment.
Four questions to ask about your knee MRI report
- Which findings on this report actually explain my symptoms?
- Which findings are probably incidental?
- Would a standing X-ray tell us more than this scan did?
- Does anything here change what we do next?
That last one matters most. Much of the time the honest answer is no, which protects you from chasing a finding instead of treating a knee. Plenty of these findings improve with nonsurgical treatment.
Some of what turns up on a knee MRI sits outside what I do. My practice is hip and knee replacement, so meniscus repair, ligament reconstruction, and cartilage restoration go to our sports medicine partners. Same building, same records.
Getting your knee evaluated in Franklin and Middle Tennessee
At the Bone and Joint Institute of Tennessee, imaging, exam rooms, and rehabilitation sit in one building. Patients from Franklin, Brentwood, Nashville, Spring Hill, and Columbia are often examined, X-rayed, and given a plan in one visit.
If a report worried you, bring it in. We’ll start with your story and an exam, then read the scan alongside all of it rather than in place of it.
To schedule an evaluation with Dr. Calendine, request an appointment online or call the Bone and Joint Institute of Tennessee at (615) 791-2630. Our office is at 3000 Edward Curd Lane, Franklin, TN 37067.
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This article is for educational purposes only and does not replace professional medical advice. Individual results vary. Always consult a qualified orthopedic surgeon or your own physician about your specific condition. Cory Calendine, MD is a board-certified orthopedic surgeon and founding partner of the Bone and Joint Institute of Tennessee in Franklin, Tennessee.
