Meniscus Tears — Do You Need Surgery?

Two very different injuries share one name

The menisci are the two crescent-shaped pads of fibrocartilage that sit between femur and tibia, spreading load across the knee. When one "tears," that word covers two conditions so different they barely belong in the same article.

The traumatic tear happens to a younger knee doing something specific — a twist under load, a pivot, a tackle. There's a moment of injury, often swelling within a day, sometimes a knee that locks or won't fully straighten. This meniscus was healthy until the moment it wasn't.

The degenerative tear happens gradually in knees over 40 as the meniscus stiffens and frays with age. There's often no injury story at all, or a trivial one — stepping off a curb, a deep squat in the garden. This kind of tear is best understood not as an accident but as one feature of a knee developing osteoarthritis.

The distinction matters more than anything else on your MRI report, because it largely determines whether surgery has anything to offer.

The fact that reframes everything

Degenerative meniscus tears are astonishingly common in people with no knee pain at all. In imaging studies of the general population, roughly a third of adults over 50 — and the majority of those over 70 — have a meniscus tear on MRI, most of them entirely asymptomatic. A tear on your scan is not proof it's the source of your pain, any more than gray hair on your head explains a headache.

This is why "the MRI shows a tear" is the beginning of the conversation, not the end. The real question is whether your symptoms, your exam, and the tear tell the same story.

What the surgical evidence actually says

Arthroscopic partial meniscectomy — trimming out the torn fragment — was for decades one of the most common orthopedic operations in the world. Then researchers ran the rigorous trials: surgery versus structured exercise therapy, and in one landmark study, real arthroscopy versus sham surgery, for degenerative tears in middle-aged patients.

The results were consistent and uncomfortable: for degenerative tears, surgery was no better than exercise therapy, and no better than sham surgery, at one to two years. Meanwhile, removing meniscal tissue permanently reduces the knee's shock absorption and is associated with faster progression of arthritis down the road. Guidelines in several countries now recommend against routine arthroscopy for degenerative tears.

None of this applies to the young knee with a traumatic tear — especially one that's locked, or a tear pattern that can be repaired (stitched, preserving the meniscus) rather than trimmed. Repairable tears in young patients are a genuinely surgical problem, and getting them to the right surgeon promptly matters.

How we approach it

Sort out which story this is. History and a hands-on exam do most of the work: age, mechanism, swelling pattern, joint-line findings, whether the knee truly locks (a mechanical block) or just hurts and hesitates. In-office ultrasound adds a look at the joint — effusion, meniscal extrusion, the state of nearby tissues. MRI enters when the answer would change the plan: suspected traumatic tear in a younger patient, a locked knee, or a presentation that doesn't fit.

For the degenerative tear: treat the knee, not the image. The evidence-backed program is progressive strengthening — quadriceps, hips, the whole leg — with load managed to what the knee tolerates, building over two to three months. Most people improve meaningfully. This is the same road as knee osteoarthritis care, because it's largely the same condition.

Manual treatment for the mechanics. A knee that won't fully extend, a stiff hip shifting load, a fibular head or pelvis contributing to the pattern — osteopathic treatment addresses the movement problem around the joint while the strength work rebuilds capacity.

Injections as a bridge, honestly labeled. An ultrasound-guided corticosteroid injection can settle a swollen, irritable knee enough to start rehab; viscosupplementation or PRP are options in the arthritic knee with their own evidence conversations. None of them "fix the tear" — they buy comfort and training time.

Surgery for the right knee. A truly locked knee, a traumatic tear in a young patient, a repairable pattern, or the degenerative case that has genuinely failed months of good rehab — those get a surgical opinion, with our full support. The point isn't that surgery is bad; it's that it should be reserved for the knees it actually helps.

What you can do right now

Keep the knee moving and loaded within comfort — walking, cycling, leg work in pain-tolerable ranges. Full rest weakens the muscles the knee is about to need. Work on getting the knee fully straight daily; a knee that loses extension develops problems on top of problems.

Don't panic-book a scope because a report used the word "tear." Read it next to the base rates above, and get an exam from someone who will put hands on the knee before recommending anything.

When to come in

Come in urgently if the knee is locked — stuck short of full extension — or if a swollen knee followed a real injury, especially with a pop. Come in soon if knee pain has persisted beyond a few weeks, if you've been handed an MRI report and a surgical recommendation and want a second read of the evidence, or if you've decided against surgery and want the non-operative plan actually done properly rather than vaguely.