You twisted your knee, it swelled, and now an exam or an MRI says the word nobody wants to hear: torn. The next question is almost always the same one. Do you need surgery?
Often, no. Many torn menisci settle with time, physical therapy and a change in activity. Some do need an operation, and for a few of them waiting makes the knee worse. This guide walks through what actually decides which group you are in.
Quick answer: do you need surgery for a torn meniscus?
Not always. Whether a torn meniscus needs surgery depends on four things: where the tear is, what kind of tear it is, whether your knee locks, catches or gives way, and whether several weeks of non-surgical care have helped.
A small tear on the outer edge of the meniscus, or a wear-related tear in a knee that does not lock, often improves without an operation. A tear that blocks the knee from straightening, or a repairable tear in an active person whose symptoms are not settling, is more likely to need arthroscopic surgery, a procedure done through a few small incisions with a camera.
First, what the meniscus does
Each knee has two menisci, C-shaped wedges of tough, rubbery cartilage that sit between the thighbone and the shinbone, one on the inner side and one on the outer side. They spread your body weight across the joint and help keep the knee stable. Our torn meniscus condition page covers the symptoms and how a tear is diagnosed. The rest of this article is about the decision that comes after the diagnosis.
What actually decides whether you need surgery
Surgeons look at the tear and at how the knee behaves, not at the word on the MRI report alone.
Where the tear is: the blood supply matters most
Only the outer part of the meniscus has a good blood supply, and that edge is sometimes called the red zone. Tears there have a real chance of healing, either on their own or after being stitched. The inner part has little or no blood supply, often called the white zone, so tears there rarely heal by themselves and are usually trimmed rather than repaired if they need treatment at all.
What kind of tear it is
Tears come in different shapes. Some are small and stable. Others, such as a large bucket-handle tear, can flip a flap of cartilage into the middle of the joint. The shape and size help decide whether the tear can be left alone, repaired or trimmed.
What your knee is doing
This is often the deciding factor. Pain and swelling alone can settle. A knee that is truly locked, so you cannot straighten it, can mean a flap of meniscus is caught in the joint, and that is a mechanical block therapy cannot remove. Catching or giving way also deserves a closer look, although in a wear-related tear these symptoms do not always come from the meniscus and can come from weak muscles, arthritis or a ligament injury.
Whether non-surgical care has helped
When the knee is not locked, most people start with several weeks of non-surgical care. If pain and function keep improving, surgery may never come up. If they plateau or get worse, the conversation changes.
Sudden tears and wear-related tears are different problems
A meniscus can tear in two quite different ways, and the answer to the surgery question often follows from which one you have.
A sudden tear from twisting
This is the classic sports or pivoting injury, often in a younger, active knee. The tear may be in tissue that is otherwise healthy, so if it sits in the outer, blood-rich part, a surgeon may try to stitch it back together to save it. Mechanical symptoms such as locking are more common with this kind of tear.
A wear-related tear in an older knee
From middle age on, the meniscus gets thinner and more brittle, and it can tear with an ordinary movement such as standing up from a squat. These degenerative tears often come with early knee arthritis. Large randomized trials have found that for many people with this kind of tear and no locking, a structured physical therapy program works about as well as arthroscopic surgery to trim the tear. That is why surgeons usually recommend therapy first for this group.
What non-surgical treatment looks like
For a tear that does not lock the knee, the usual first steps are:
- Activity changes. Avoid deep squats, pivoting and twisting while the knee calms down.
- Ice, elevation and anti-inflammatory medicine for swelling and pain, if they are safe for you.
- Physical therapy to strengthen the thigh and hip muscles that take load off the joint and to restore motion.
- An injection for pain in some cases, so that you can do the therapy. Our article on the cortisone shot for knee pain explains what to expect.
Give this a fair trial, often several weeks, and keep track of whether walking, stairs and sleep are getting easier. Steady improvement is a good sign that surgery may not be needed.
When surgery is usually the better choice
A surgeon is more likely to recommend an operation when:
- The knee is locked and will not straighten, a sign that a flap of torn cartilage may be blocking the joint.
- The tear is in the outer, blood-rich part and looks repairable, especially in a younger or active person.
- Pain, swelling or giving way continue after a proper course of non-surgical care.
- The meniscus tear came with another injury, such as a torn ligament, that is being repaired anyway.
Almost all meniscus surgery is done arthroscopically. Read more about arthroscopic knee surgery and what happens on the day.
Repair or partial removal: the two kinds of meniscus surgery
There are two main operations, and they recover very differently.
Meniscus repair: stitching the tear
In a meniscus repair, the surgeon sews the torn edges together so the tissue can heal. It is only possible when the tear is in a part of the meniscus with a blood supply and the tissue is healthy enough to hold stitches. The upside is that you keep your shock absorber. The trade-off is a longer recovery: you protect the knee for several weeks, often with crutches and a brace, and full rehabilitation usually takes three to six months, with a return to sports often toward the later end of that range.
Whenever a tear can be repaired, our surgeons prefer repair over removal, because keeping the meniscus protects the knee over the long term.
Partial meniscectomy: trimming the damaged piece
In a partial meniscectomy, the surgeon trims away only the torn, unstable part and leaves the healthy meniscus behind. It is used when a tear cannot heal, for example in the inner white zone. Recovery is shorter, and many people are walking without crutches within days and back to most daily activities within a few weeks. The trade-off is that less meniscus means less cushioning, which raises the long-term risk of arthritis in that part of the knee.
Can you walk on a torn meniscus, and will it get worse if you wait?
Many people can walk on a torn meniscus, especially once the first swelling goes down, so being able to walk does not mean the tear is minor. What tends to make a tear worse is repeated twisting, pivoting and deep squatting, which can extend the tear or flip a flap into the joint.
For a stable tear that is improving, waiting while you do therapy is a reasonable plan. For a knee that is locked, or one that keeps catching or giving way, have it examined rather than waiting it out, because a repairable tear can become one that can only be trimmed if it keeps tearing.
Signs that should not wait
See an orthopedic specialist promptly if your knee is locked and will not straighten, you cannot put weight on the leg, the knee swelled heavily right after the injury, or it keeps giving way. Go to an emergency room if the knee is red, hot and swollen with a fever, or if the leg below the knee becomes numb, cold or pale.
Next step: get the decision made on your knee, not on a report
An MRI can show a tear in many knees that are not causing much trouble, which is why the decision rests on the exam, your symptoms and how your knee has responded so far, not on the scan alone. Mountain Spine & Orthopedics offers a free MRI review, so if you already have imaging, our orthopedic team can review it and help you plan the next step, which usually includes an in-person exam before any decision about surgery. Request an appointment to get started.
Frequently Asked Questions
Answers to the most common patient questions about this topic.
Can a torn meniscus heal on its own?
Sometimes. Small tears in the outer part of the meniscus, where there is a blood supply, can heal or settle with rest and physical therapy. Tears in the inner part have little or no blood supply and rarely heal on their own, although they may stop causing symptoms.
What does a torn meniscus feel like?
Common signs are pain along the inner or outer side of the knee, swelling that builds over the first two or three days, stiffness, and trouble fully straightening the knee. Some people feel catching or locking, or the knee gives way.
Will walking on a torn meniscus make it worse?
Normal walking is usually fine once swelling settles. Twisting, pivoting and deep squatting are more likely to make a tear bigger. If walking causes locking, catching or giving way, have the knee examined.
How long does a torn meniscus take to heal?
It depends on the tear and the treatment. Many stable tears improve over several weeks of non-surgical care. After a partial meniscectomy, many people return to most daily activities within a few weeks. After a meniscus repair, full rehabilitation usually takes three to six months.
How successful is arthroscopic knee surgery for a torn meniscus?
For the right tear, results are generally good, especially when a locked or catching knee is freed or a repairable tear is stitched. For many wear-related tears without locking, studies have found physical therapy works about as well as surgery, so it is usually tried first.
Can you walk with a torn meniscus?
Many people can, which is why a tear can go unnoticed for a while. Being able to walk does not rule out a tear that needs treatment, especially if the knee swells, locks or gives way.
