Meniscus Tears: Surgery or Rehab?

Being told you have a torn meniscus can sound like your knee needs fixing. For many people, though, rehab is the recommended first step, and surgery is saved for specific situations. Here's how to tell which group you're in.

"There's a tear in your meniscus." It's a phrase that makes a lot of people assume they'll need an operation. And for a long time, knee arthroscopy to trim or repair a torn meniscus was one of the most common orthopaedic operations performed in Australia.

Over the past 15 years, though, research has changed how we think about meniscus tears. We now know that many tears, particularly in people over about 35 or 40, respond just as well to a structured rehab program as they do to surgery. At the same time, there are some tears where surgery is clearly the right call, and getting the timing right matters.

In this post I'll explain what the meniscus does, the different types of tears, what the research says about surgery versus rehab, and how I help people decide on the right path.

You have two menisci in each knee, a medial meniscus on the inside and a lateral meniscus on the outside. They are C-shaped pieces of tough, rubbery fibrocartilage that sit between your thigh bone (femur) and shin bone (tibia).

The menisci have a few important jobs:

• Spreading load: they increase the contact area between the femur and tibia, spreading the forces that go through your knee when you walk, run and land.
• Shock absorption: they help cushion the knee from impact.
• Stability: they deepen the joint surface and help keep the knee stable, working alongside the ligaments, including the ACL.
• Joint health: they help distribute joint fluid, which nourishes the cartilage.

Only the outer edge of the meniscus has a good blood supply. This outer third, often called the red zone, has the best chance of healing. The inner part, the white zone, has very little blood supply and is much less likely to heal on its own. This becomes important when we talk about surgical repair.

When people talk about meniscus tears, they're often lumping together two quite different problems.

These usually happen in younger, active people during sport. The classic mechanism is twisting on a bent knee with your foot planted, for example changing direction in football, netball or basketball, or getting up awkwardly from a deep squat. People often feel a pop or a tear, followed by pain along the joint line and swelling that develops over the next day.

Traumatic meniscus tears often happen alongside other injuries, particularly an ACL rupture. Some traumatic tears, such as a large "bucket handle" tear, can flip into the joint and physically block the knee from straightening.

These are far more common, especially from middle age onwards. As we get older, the meniscus naturally becomes a little less elastic and more prone to fraying and small horizontal or complex tears. These tears can happen with very little force, like a squat or getting up from the floor, or they can develop gradually with no clear injury at all.

Here's the key thing: degenerative meniscus tears are very common in people with no knee pain at all. MRI studies have found them in a large proportion of middle-aged and older adults who have no symptoms. That means if you're over 40 and have an MRI of your knee for any reason, there's a reasonable chance it will show a meniscus tear, whether or not that tear is the cause of your pain. Degenerative tears also often sit alongside early knee osteoarthritis.

Common symptoms include:

• Pain along the inside or outside joint line of the knee
• Swelling, often developing over 24 hours rather than straight away
• Pain with twisting, pivoting, deep squatting or kneeling
• Clicking or catching sensations
• A feeling of the knee giving way
• True locking, where the knee gets stuck and won't fully straighten

It's worth separating catching from true locking. Many people describe their knee as "locking" when it catches briefly or feels stiff, which is common and usually not a concern. True mechanical locking, where the knee physically can't straighten until it's wiggled free, is less common and more significant.

The most common surgery for meniscus tears is an arthroscopic partial meniscectomy, where the torn part of the meniscus is trimmed away through keyhole surgery. Over the past decade or so, several high-quality trials have compared this surgery with exercise-based physiotherapy, and in some cases with a placebo "sham" surgery, for people with degenerative tears.

The results have been consistent. For people with degenerative meniscus tears, arthroscopic partial meniscectomy generally didn't produce better outcomes than exercise therapy or sham surgery. People improved in both groups, often substantially, but surgery didn't add a meaningful benefit for most. Some people in the exercise groups did go on to have surgery later if they didn't improve, but most didn't need to.

There's another consideration too. Removing part of the meniscus reduces its ability to spread load across the knee, and there's evidence that meniscectomy is associated with a higher risk of developing knee osteoarthritis over time. That's one reason surgeons are now much more likely to try to repair a tear where possible, rather than remove part of it, and much more cautious about operating on degenerative tears at all.

Because of this research, clinical guidelines now recommend exercise therapy as the first-line treatment for most people with degenerative meniscus tears, with surgery considered only if symptoms don't improve or if there are specific mechanical problems.

None of this means surgery is never appropriate. There are situations where a surgical opinion is important, and sometimes the sooner the better:

• A locked knee: if your knee is stuck and can't fully straighten, a displaced tear such as a bucket handle tear may be blocking it. This usually needs a prompt orthopaedic review.
• A repairable tear in a younger person: traumatic tears in the outer, well-supplied part of the meniscus in younger, active people may be suitable for repair. Repairs have better long-term results when done relatively early.
• Tears combined with an ACL rupture: these are often managed together, and the plan depends on your ACL decision.
• Ongoing mechanical symptoms or failed rehab: if your knee keeps catching, locking or giving way, or you haven't improved after a good three months of structured rehab, it's reasonable to discuss surgery.

Meniscus repair is a different operation from meniscectomy. Instead of removing the torn part, the surgeon stitches the meniscus back together. Recovery after a repair is longer and more protected, often with restrictions on weight bearing and deep bending for several weeks, but it preserves more of the meniscus.

For most people, meniscus rehab follows a staged approach. The exact plan depends on the type of tear, your symptoms and your goals.

The first goal is to calm the knee down. That means reducing swelling, restoring the ability to fully straighten and bend the knee, and getting the quadriceps working again. Swelling switches off the quads very effectively, so early exercises focus on quad activation, gentle range of motion and keeping you walking normally. We modify activities that aggravate the knee for a while, such as deep squats, twisting and kneeling.

Strength is the foundation of meniscus rehab. Strong quads, hamstrings, hips and calves help absorb load and protect the knee. Exercises usually progress from leg press, bridges and step-ups through to squats, split squats, step-downs and single-leg work. Most people need around 8 to 12 weeks of consistent strength training to see meaningful changes.

Next, we add balance, control and movements that load the knee in different directions, like lunging, lateral movements and controlled pivoting. This helps restore trust in the knee, which is often as important as the strength itself.

For people returning to sport, the final stage builds up running, jumping, landing, cutting and sport-specific drills. Before returning to full training, I like to see a calm knee with no ongoing swelling, strength similar to the other leg, and confidence with the movements your sport demands. Much of this later work can happen on the field or court, which I cover on my field and court rehab page.

Throughout rehab, I use a simple guide: some discomfort during exercise is fine if it stays mild, settles within an hour or so, and the knee isn't more swollen or sore the next morning. Increased swelling is a sign to pull back for a few days and build up more gradually.

Not always. Many meniscus injuries can be diagnosed clinically from the history and a physical assessment, and for degenerative tears, an MRI often doesn't change the plan, because rehab is the first step either way. An MRI is more useful when surgery is being considered, when the knee is locked, when a significant ligament injury such as an ACL tear is suspected, or when you aren't improving as expected. If I think you need imaging, I'll write to your GP to organise it.

It's also worth remembering that because degenerative tears are so common in people without pain, a tear on an MRI isn't always the cause of your symptoms. That's why a clinical assessment that looks at the whole picture matters.

Recovery depends on the type of tear and the treatment:

• Degenerative tears managed with rehab: many people notice meaningful improvement within 6 to 12 weeks, with continued progress over several months.
• Traumatic tears managed with rehab: return to sport often takes 6 to 12 weeks, depending on the size of the tear and the demands of your sport.
• After a partial meniscectomy: many people return to sport within 6 to 8 weeks, though the knee may take longer to feel fully settled.
• After a meniscus repair: recovery is longer, commonly 4 to 6 months before a return to pivoting sport, guided by your surgeon's protocol.

I'll give you a realistic estimate after your assessment, and we'll use testing rather than just the calendar to decide when you're ready for each step.

If you've been told you have a meniscus tear, here's how I generally approach it with clients:

• If your knee is locked or you can't straighten it, get an orthopaedic opinion promptly.
• If you're younger and had a clear traumatic injury, particularly with significant swelling or a suspected ACL injury, a surgical opinion early can be worthwhile to see if a repair is an option, while we start rehab straight away.
• If you're over 35 to 40 and your tear came on with little or no injury, a structured rehab program of around three months is usually the best first step.
• If you've given rehab a genuine go and you're still struggling with mechanical symptoms or not progressing, it's reasonable to discuss surgery with a specialist.

Whichever path you take, rehab plays a central role. If you have surgery, I also see clients at home in the early weeks afterwards, which you can read about on my physio after surgery page.

When I assess a knee with a suspected meniscus injury, I look at how the injury happened, what your knee is doing now, and what you want to get back to. I'll check your swelling, range of motion and strength, and use specific tests for the meniscus and ligaments. From there, I'll explain what I think is going on, whether I think a scan or surgical opinion is needed, and what your rehab plan looks like.

Because I'm a mobile physio, I come to you, at home, at work or at your training ground. You can read more about how I assess and treat knee problems on my knee pain physiotherapy page, and my rehabilitation programs can map out your rehab over 3, 6 or 12 weeks.

A torn meniscus doesn't automatically mean surgery. For most degenerative tears, rehab is the recommended first step and works well for many people. Surgery has an important place for locked knees, repairable traumatic tears and knees that don't improve with good rehab. Getting a proper assessment, understanding what type of tear you have, and starting the right rehab early will give you the best chance of getting back to doing what you love.

This article is general information only and isn't a substitute for an individual assessment. If you have pain or an injury, speak with your physiotherapist or GP about your situation.

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