A Torn Meniscus Isn’t Just One Injury

Posted on: November 2nd, 2026 by Our Team

The knee’s shock absorber can tear in many ways. Fixing it well depends on knowing exactly which kind you’re dealing with.

A college soccer player plants her foot to cut past a defender and feels something give in her knee. She finishes the game. By the next morning the knee is swollen and stiff, but within a week or two it feels mostly fine, so she goes back to practice.

A few weeks later, she squats to tie her shoe and her knee gets stuck. She can’t straighten it. Her MRI shows a bucket-handle tear of the meniscus, and she comes in with the two questions nearly every patient asks. Is this serious? Do I need surgery?

For her, the answers are yes and yes. For someone else with “meniscus tear” on an MRI report, they might be no and no. It depends on the type of tear, and on whether the surgeon treating it has the skill to fix that particular kind.

What the meniscus does

Each knee has two, one on the inner side and one on the outer side. They are C-shaped wedges of tough, rubbery tissue that sit between the thighbone and the shinbone.

In my last blog post I compared cartilage to the pavement on a road. The meniscus is the tire. Like a tire, it spreads the force of every step so no single spot on the cartilage takes the full load, and it helps steady the knee when you twist or pivot. When the meniscus does its job, cartilage lasts. When it doesn’t, the knee is essentially driving on the rim, grinding away the pavement that is your cartilage.

Why a meniscus works like a tire

Here is the part most people have never heard: The meniscus works the way a tire does.

A tire can carry the weight of a car because its walls are held in tension. When you put weight on your knee, the thighbone presses down and tries to squeeze the meniscus outward. The meniscus resists by tightening around its curve, much like the walls of a tire. Surgeons call that tension hoop stress, and it’s what allows the meniscus to carry load.

Each end of the meniscus is anchored to the bone by a root, the way a tire’s bead is seated on the rim. Slash the sidewall, or pop the bead off the rim, and the tire can’t hold anything. The same thing happens when a tear cuts across the meniscus or rips it loose from its root. The meniscus can slide out of the joint, a problem called extrusion, and the cartilage underneath is left unprotected.

Not all tears are alike

“Meniscus tear” covers a wide range of injuries.

Traumatic tears happen with a sudden twist or cut, usually in younger or more athletic patients. These are the tears we see most often as surgeons, and many of them can and should be repaired.

A bucket-handle tear, like the soccer player’s, is a large traumatic tear in which a long strip of meniscus flips into the middle of the joint, like a wedge jammed in a door hinge. The knee locks, and it needs prompt surgery.

Radial tears are the slashed sidewall. They cut across the hoop, and even when they look small on a scan, they can wipe out the meniscus’s ability to carry load. Root tears are the bead popping off the rim. Athletes get them, but they can also happen with surprisingly little force in middle-aged patients, sometimes just from standing up after kneeling in the garden. Either one can leave the knee behaving almost as if the meniscus were gone and, left untreated, lead to rapid cartilage breakdown.

Degenerative tears develop gradually, like an old tire wearing thin. They’re common on MRIs of people over 40, including many people with no pain. For many of these patients, if the knee isn’t locking, large clinical trials have shown that arthroscopic trimming offers little advantage over a good course of physical therapy. Arthroscopic surgery is done through a few small incisions, using a pencil-sized camera called an arthroscope to see inside the knee.

What a tear feels like

Common signs include pain along the inner or outer edge of the knee, swelling that builds over a day, catching, and a sense that the knee might give way. Locking matters more than pain, because it usually means something is physically in the way.

Save the meniscus whenever possible

A few decades ago, surgeons routinely removed the entire meniscus, believing it served little purpose. Years later, many of those patients developed arthritis. We now know that removing even part of the meniscus raises the pressure on the cartilage beneath it. Today the goal is to preserve as much meniscus as possible, and when it’s torn, to restore the hoop.

When surgery is needed, the main options are repair, which stitches the torn tissue back together; root repair, which reattaches a torn root to the bone; and partial meniscectomy, which trims away only what truly can’t be saved. For younger patients who have already lost most of a meniscus, meniscal allograft transplantation replaces it with a meniscus from a donor. Allograft simply means donor tissue. As with cartilage, any alignment problem overloading that side has to be corrected too.

Why the surgeon’s toolbox matters

Every tear pattern asks something different of the surgeon, and restoring hoop stress means matching the technique to the tear.

A tear in the back of the meniscus may call for all-inside repair, which uses small anchoring devices placed entirely through the arthroscope. Many tears in the middle portion, including most bucket-handle tears, are best fixed with inside-out repair, in which stitches are passed across the tear from inside the joint and tied through a small incision on the side of the knee. Tears toward the front often need an outside-in technique, with stitches passed from outside the knee into the joint. Reseating a torn root means pulling it back down to its attachment, usually through a small tunnel drilled in the shinbone. Radial tears need stitches that close the slashed sidewall. A meniscus that has slid out of the joint may need to be anchored back into place, a procedure called centralization.

A surgeon comfortable with only one or two of these techniques will eventually meet tears that don’t fit them, and those tears tend to get trimmed rather than fixed. A trimmed meniscus is a tire with a chunk cut out of it. It can’t hold the hoop, and the road pays the price. Being able to choose the right repair for each tear, sometimes several in the same knee, is what turns a torn meniscus back into a working one.

Back to the field

For the soccer player, the displaced strip was flipped back into position and stitched in place. A repair means a longer recovery than trimming, typically several months before she’s cleared to play again. But she’ll return on a meniscus that still works, which is the best protection her cartilage has for the rest of her career.

A tear on its own tells us little. What matters is whether it has changed the way the knee carries weight, and whether it can be repaired so the knee isn’t left driving on the rim.