General information to help you prepare for a conversation with your clinician.
Seeing tear in an MRI report can make surgery feel like a decision that has already been made. It hasn’t. You still deserve an explanation of how that finding fits your knee, what rehab could offer, and why an operation is being suggested.
One question to bring with you“If this were my scan, what would you want to know about my symptoms before recommending surgery?”
What the meniscus does
Each knee has two C-shaped pads of cartilage, the menisci, that cushion the joint and help it stay stable. They can tear in two broad ways.
- A sudden tear from a twist, a pivot or a deep squat, often in a younger and active person. These can be repairable, and the decision is more time sensitive.
- A gradual, degenerative tear that develops with wear, usually from the 40s on. These often show up on MRI in people whose knees feel fine, which is part of why the scan alone cannot make the decision.
What the major trials found
Three randomized trials are worth knowing about, because they tested surgery against something real.
- Surgery versus a pretend operation. In a Finnish trial of 146 adults aged 35 to 65 with a degenerative medial meniscus tear and no knee arthritis, partial meniscectomy was no better than a sham procedure after a year.
- Surgery versus physical therapy. In a US trial of 330 adults aged 45 and older with a meniscal tear and mild to moderate arthritis, people who started with physical therapy improved about as much as people who had surgery at six months and at twelve. About 30% of those assigned to therapy chose surgery within six months.
- Surgery versus exercise. In a Norwegian trial of 140 adults with a degenerative tear confirmed on MRI, twelve weeks of supervised exercise and arthroscopic surgery had no clinically meaningful difference at two years. About 19% of the exercise group crossed over to surgery.
The takeaway is not that surgery never helps. It is that for a gradual tear, trying structured rehab first is a reasonable, evidence-backed starting point, and you can still have surgery later if it does not work.
When surgery gets a serious look
Surgery moves higher on the list when the picture is different from the trials above.
- Your knee locks and will not fully straighten, or it catches in a way that stops you moving.
- A large or displaced tear shows on imaging, especially after a clear injury.
- You are younger and the tear looks repairable. Repair, when it is possible, is often time sensitive.
- You have done a proper course of rehab, usually a few months, and the knee is still not usable.
A locked knee, a knee that suddenly cannot take weight, or a hot swollen knee with a fever are reasons to be seen promptly, not to wait for a waitlist.
What to ask your surgeon
- Is my tear sudden or degenerative, and does that change the plan?
- What on the images makes you recommend surgery, and what would change your mind?
- What happens if I do a structured rehab program first and it does not work?
- Would you repair this, or trim it, and why?
- How much of my pain could be from arthritis, which this surgery does not fix?
If the recommendation does not line up with what you read here, getting another surgeon to look at the same scan is a normal step. We cover how in How to get a second opinion on an MRI.
Quick answers
Can a meniscus tear heal on its own?
Some do, especially tears at the outer edge where there is a better blood supply, and many gradual tears settle into a manageable knee with rehab. Others do not heal and may or may not keep bothering you.
Is meniscus surgery a quick fix?
Not necessarily. The trials above found partial meniscectomy was no better than sham surgery or physical therapy for many gradual tears. Recovery also takes weeks, and rehab is part of it either way.
Does a tear on my MRI always cause my pain?
No. Meniscus changes are common on MRI in people without knee symptoms, which is why your surgeon should match the scan to your symptoms and an exam.
Want a surgeon to look at your scan?
Second Look is a written opinion from an orthopedic surgeon on the X-ray, MRI or CT you already have. It is opening soon. Join the free waitlist and we will email you when it opens in your state.
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If there’s a question you wish this guide answered, suggest a topic. Keep it general; please don’t email scans or personal medical information.
Sources
- AAOS OrthoInfo: Meniscus tears
- Sihvonen et al., NEJM 2013: Arthroscopic partial meniscectomy versus sham surgery for a degenerative meniscal tear
- Katz et al., NEJM 2013: Surgery versus physical therapy for a meniscal tear and osteoarthritis
- Kise et al., BMJ 2016: Exercise therapy versus arthroscopic partial meniscectomy for degenerative meniscal tear