Meniscus Tear: Surgery or Physiotherapy? What the Evidence Says

Two patients come to mind, because they sat in my clinic at Aster MIMS Kannur in the same week, both holding an MRI report with the same three words on it: tear of meniscus. The first was a fifty-four-year-old teacher whose knee had been aching, on and off, for the better part of a year, with no injury she could name. The second was a twenty-two-year-old footballer whose knee had buckled in a tackle, swelled up overnight, and now would not fully straighten. Same words on the scan. But these are two completely different problems, and the right answer for one would be close to the wrong answer for the other.

The question I am asked most often about the meniscus is the one in the title: do I need surgery, or will physiotherapy do? For once the research gives us a genuinely useful answer, as long as we are willing to ask which knee we are talking about. So let me lay it out the way I would across the desk.

First, what is the meniscus, and why does it matter?

Each knee has two menisci, crescents of tough rubbery cartilage between the thigh bone and the shin bone, one on the inner side and one on the outer. Think of them as cushions and spacers. They spread your body weight over a wider area, absorb shock, and help the joint stay stable. When a meniscus is healthy, you never think about it. When it tears, the knee can hurt, swell, click, or in some cases physically catch and lock.

Keeping the meniscus matters, and this is the single idea that runs underneath everything that follows. The meniscus protects the surfaces of the joint. When a large amount of it is removed, the knee loses some of that protection, and over the long run the risk of wear and arthritis goes up. That is why modern surgery, when it is needed at all, leans hard towards saving the meniscus rather than simply cutting the torn part out. European expert consensus now states plainly that preserving the meniscus should be the first choice when a tear is being operated on, because the long-term results for the joint are worse after the torn part is trimmed away than after it is repaired.

The two kinds of tear, and why the distinction is everything

Here is the fork in the road. Meniscus tears fall, broadly, into two groups, and they behave so differently that lumping them together is the commonest source of confusion I see.

A degenerative tear is wear and tear. It develops slowly, usually in a knee that is over thirty-five and often over fifty, frequently without any clear injury at all. The cartilage has simply become more brittle with the years and has split. These tears very often travel together with the early stages of arthritis. My teacher with the year of vague aching had this kind.

A traumatic tear happens at a definite moment, in an otherwise healthy meniscus, usually from a twist or a sporting impact in a younger knee. There is a story: a tackle, a fall, a sudden pivot, then swelling and sometimes a knee that locks. My young footballer had this kind.

Almost every difference of opinion about meniscus surgery dissolves once you separate these two, because the evidence for each points in a different direction.

For the worn, middle-aged knee: what the trials actually found

This is where the research is genuinely strong, because several large, well-conducted randomised trials have asked exactly this question. Their answer has been remarkably consistent.

Start with the Kise trial from Norway, which split middle-aged adults with a degenerative tear into two groups: twelve weeks of supervised exercise therapy, or keyhole surgery to trim the tear. At two years there was no clinically meaningful difference between them in how the knee felt and functioned. The exercise group actually built more thigh muscle strength in the early months. Importantly, almost all of these patients had no definite arthritis on their X-rays, so this was the meniscus tear being treated on its own merits.

The Finnish FIDELITY trial went a step further and compared keyhole surgery against a sham operation, where patients were taken to theatre and given all the trappings of surgery, including small incisions, but the tear was not actually trimmed. At one year, the real surgery was no better than the fake one for a degenerative tear in a knee without arthritis. That is a sobering result, and an honest one, because it tells us how much of the early improvement people feel comes from time, rehabilitation and expectation rather than from the trimming itself.

The American METEOR trial looked at people who had both a meniscus tear and mild-to-moderate arthritis, comparing surgery plus physiotherapy against physiotherapy alone. Again, no significant difference in function at six months. The Dutch ESCAPE trial, in people with non-locking tears, found physiotherapy to be no worse than surgery in knee function over two years. Four large trials, four populations, one direction of travel.

When researchers pooled this body of work formally and graded its quality, the conclusion was that, for degenerative knee disease, keyhole surgery offers at best a very small reduction in pain in the first few months, around five points on a hundred-point scale, which fades to little or nothing by two years. On the strength of all this, an international guideline panel made a strong recommendation against keyhole surgery for almost everyone with a degenerative meniscus tear, and European specialist consensus agrees that surgery should not be the first line of treatment for these tears.

For the injured or locked knee: when surgery genuinely earns its place

Now turn the page to my young footballer, and the picture changes. The trials above were done in middle-aged and older knees with degenerative or non-locking tears. They deliberately excluded young athletes and excluded knees that physically lock. You cannot take their reassuring conclusion and apply it to a twenty-two-year-old whose knee will not straighten. That would be a misreading of the evidence.

There are situations where surgery is clearly the better path, and they are worth knowing:

A locked knee is the clearest of all. When a torn fragment, classically a bucket-handle tear, flips into the middle of the joint and physically blocks movement, no amount of physiotherapy can lift it back out. This usually needs prompt assessment and surgical planning, though the current evidence suggests it is a matter of timely, well-planned surgery rather than a same-night emergency.

A traumatic tear in a young, active knee is the other main case. Here the meniscus was healthy until the injury, the person has many decades of loading ahead, and protecting that cushion is worth a great deal. European consensus on traumatic tears places meniscus preservation as the first goal, and is explicit that when a repair is needed it should be done early, and that many tears once written off as irreparable can in fact be repaired.

Repair or trim? The choice that matters for the long run

When surgery is the right call, the next question is what kind. Broadly there are two operations. The surgeon can repair the tear, stitching the torn edges so the meniscus heals and stays intact, or trim the damaged part away, which is quicker to recover from but removes tissue the knee may miss in twenty years.

Where a tear can be repaired, repair is generally the better long-term choice, because a preserved meniscus keeps protecting the joint. The honest trade-off is that repairs do not always hold. Pooled data on repairs of traumatic tears show that a portion fail over time, with the all-cause failure rate rising from roughly one in eight in the first year to around one in five by four to six years. Even so, in those same knees the development of arthritis was relatively low over the medium term, which is the whole point of saving the meniscus rather than removing it. Whether your particular tear can be repaired depends on its pattern, where it sits, its blood supply, and your age and activity. It is genuinely a decision that can only be finalised once the tear is seen, sometimes only at the time of surgery.

So what do I actually tell people?

For the worn, middle-aged knee with a degenerative tear and no locking, I almost always start with a proper course of physiotherapy: building the muscles around the knee, restoring movement, managing weight and load, and giving it real time. The evidence says this works about as well as surgery for most such knees, with none of the operative risk, and with the bonus of stronger muscles. If, after a fair trial of that, the knee genuinely is not settling, then surgery can be reconsidered, but as a second step, not a first reflex.

For the young, injured knee, the locked knee, or the clearly mechanical tear, I do not waste months on physiotherapy that cannot fix a blocked joint. There I move towards surgery, with the firm intention of repairing and saving the meniscus wherever the tear allows it.

The art, and the reason this needs a person and not a flowchart, is that real knees do not always announce which category they belong to. Plenty sit somewhere in between. That is the conversation worth having properly.