Meniscus Tear: Do You Need Surgery, or Physiotherapy?

What the meniscus does

Each knee has two menisci — C-shaped wedges of cartilage sitting between the thigh bone and the shin bone. They spread load across the joint, add stability, and help the surfaces glide.

That load-spreading role is the reason the decision about a tear matters so much. Removing meniscal tissue reduces the area over which force is distributed, which increases pressure on the joint surface. That has consequences measured in decades, not weeks — which is why "just trim it out" is a bigger decision than it sounds.

The distinction that decides everything

Almost every useful conversation about meniscus tears starts by separating two situations that share a name and share very little else.

The traumatic tear. A specific incident — a twist on a planted foot, a football pivot, a fall while skiing. The person can usually name the moment. The knee swells over hours, and there is often a clear mechanical feeling of something catching. This is typically a younger, otherwise healthy knee.

The degenerative tear. No single incident, or a trivial one such as standing up from a squat. Pain builds over weeks. The person is usually in their forties or beyond, and the surrounding cartilage already shows some wear. The meniscus here has not been torn so much as it has worn through.

These two are not variations of one problem. They behave differently, they respond to different treatment, and confusing them is how people end up with operations that do not help.

The degenerative tear: what the evidence actually says

This is where the honest answer differs most from the popular assumption.

Multiple randomised trials have compared arthroscopic partial meniscectomy — keyhole surgery to trim the torn part — against structured exercise therapy for degenerative meniscal tears. The consistent finding is that exercise therapy performs comparably at follow-up, without the operation.

That evidence has changed practice internationally. Several national guidelines now recommend against routine arthroscopy for degenerative meniscal tears and knee osteoarthritis.

I mention this plainly because patients are rarely told it. The instinct on seeing "meniscal tear" on a report is that something is torn and therefore needs fixing. In this group, in most cases, it does not.

Why an MRI finding is not a diagnosis

Here is the fact that reframes the whole conversation: meniscal tears are extremely common findings on MRI scans of knees that are entirely painless.

The prevalence rises steadily with age. In middle-aged and older adults, a substantial proportion of people with no knee symptoms at all will have a meniscal tear visible if you scan them.

So the presence of a tear does not establish that the tear is causing the pain. What establishes that is the clinical picture — the history, the examination, and whether the symptoms fit the finding. A scan interpreted without that context leads directly to operations that treat an image rather than a person.

The traumatic tear: when surgery is genuinely indicated

None of the above applies in the same way to a young, active knee with a clear injury.

Surgery deserves serious consideration when:

• There is a true mechanical block — the knee physically will not straighten fully
• The knee repeatedly locks or gives way in a way that fits the tear
• The tear is a type and location that can be repaired, particularly in a younger patient
• Symptoms are clearly mechanical rather than diffusely painful, and have not settled with appropriate rehabilitation
• The tear accompanies another injury requiring surgery, such as an ACL rupture

The pattern that most reliably justifies operating is mechanical: catching, locking, blocking. Diffuse aching, stiffness and swelling in an older knee is a different story with a different answer.

A locked knee is not a wait-and-see problem

One presentation deserves separating out.

If the knee is genuinely locked — physically unable to straighten fully, with a firm block rather than pain stopping you — that can indicate a displaced fragment of meniscus caught in the joint. It should be assessed promptly rather than managed with time and painkillers.

The distinction is between cannot and will not. A knee that will not straighten because it hurts is common and usually not urgent. A knee that cannot straighten because something is physically in the way is different.

What rehabilitation actually involves

"Physiotherapy instead of surgery" is sometimes heard as "do nothing instead of surgery". It is not that at all.

Effective treatment for a degenerative meniscal tear is a structured, progressive programme, and the trials that showed equivalence used real supervised exercise, not advice to rest.

It typically involves:

• Settling the irritable phase, with relative rest from provoking loads rather than complete rest
• Restoring full range, particularly full extension
• Progressive quadriceps and hip strengthening, which is the core of the programme
• Reintroducing load gradually, including the deeper knee bend positions that usually provoke symptoms
• A realistic timeline — meaningful change over two to three months, not two to three weeks

The commonest reason this route "fails" is that it was never genuinely completed.

Repair or remove — and why it matters

When surgery is indicated, there are two broad options, and they are not equivalent.

Repair stitches the torn tissue so it can heal, preserving the meniscus and its load-spreading function. It is possible when the tear is in a location with adequate blood supply and of a suitable pattern, and it is more likely to be achievable in younger patients.

Partial removal trims away the damaged portion. It settles mechanical symptoms more quickly, but it permanently reduces meniscal tissue, and less meniscus means higher contact pressure on the joint surface over the following decades.

Where a repair is feasible, it is generally the better long-term choice even though recovery is slower and more restricted. This is a question worth asking your surgeon directly before agreeing to an arthroscopy: is this tear repairable, and if not, why not?

Warning signs that need prompt review

• A knee that is locked and cannot be straightened
• A knee that gave way at the moment of injury with immediate, rapid swelling, which raises the possibility of a ligament injury
• Inability to weight-bear after the injury
• A hot, swollen knee with fever, which requires urgent medical assessment
• Rapidly increasing swelling in the hours after a twist

What an assessment looks for

• The mechanism — a specific twisting incident, or a gradual onset
• Whether symptoms are mechanical — catching, locking, blocking — or predominantly painful
• Full extension, tested carefully, because a block changes the plan
• Joint line tenderness and provocation tests, interpreted together rather than individually
• Ligament stability, since meniscal and ligament injuries frequently occur together
• The state of the surrounding cartilage, which is what separates the two tear types
• An MRI only where it will change the decision, not as a reflex

What we would do at IDUNN

The first task is establishing which of the two situations we are in, because it determines everything else. That comes from the history and examination, and a scan is ordered when it will genuinely change what we do.

If it is a degenerative tear, we say clearly that the published evidence supports exercise-based treatment as a first approach, and we put a proper programme in place with a realistic timeline — rather than scheduling an arthroscopy that the evidence does not support.

If it is a traumatic tear with mechanical symptoms in an active knee, surgery is discussed properly, including whether the tear is repairable rather than only removable.

And if the knee is locked, it is assessed promptly. That is the one presentation here where waiting is not neutral.

Does a meniscus tear lead to arthritis later?

This question comes up often, and it deserves a careful answer rather than reassurance.

The meniscus spreads load across the knee. Anything that reduces the amount of functioning meniscal tissue increases the pressure on the joint surface, and that has long-term consequences.

Two honest points:

• Removing meniscal tissue is associated with a higher rate of later osteoarthritis than keeping it. This is a well-recognised relationship and it is the strongest argument for preferring repair over removal, and for not operating on a tear that is not causing mechanical symptoms.
• A degenerative tear is often an early sign of joint wear rather than a cause of it. In that group, the tear and the arthritis are part of the same process. Removing the torn fragment does not stop the process, which is part of why the trials found no advantage.

What this means practically is not alarming. It means the decision to remove meniscal tissue should be made for a good reason, and that a knee which is working well with a tear still visible on a scan is in a better position than a knee that has had tissue removed unnecessarily.

Keeping the surrounding muscles strong and managing load sensibly are the things you can actually influence, and both matter over the following decades.