A torn meniscus typically causes pain along the side of the knee, swelling that develops over 24 hours or more, and a sensation of catching or locking when you try to bend or straighten your leg. Some tears produce dramatic symptoms right away, while others start subtly and worsen over days or weeks.
The meniscus is a C-shaped piece of rubbery cartilage that sits between your thighbone and shinbone, acting as a shock absorber. Each knee has two: one on the inner side (medial) and one on the outer side (lateral). When one tears, the symptoms depend on the size, location, and type of tear.
Pain and Where You Feel It
The most common symptom is pain along the joint line of your knee, meaning the narrow gap where your upper and lower leg bones meet. If the tear is on the inner meniscus, the pain concentrates along the inside of your knee. A lateral tear produces pain on the outside. The pain often sharpens when you twist, squat, or pivot on the affected leg.
In many cases, you can still walk on a torn meniscus, and some people continue playing sports immediately after the injury before symptoms fully set in. That delayed onset is one reason meniscus tears get overlooked early on. The pain may feel manageable at rest but flare with specific movements, especially deep bending, kneeling, or getting up from a chair.
Swelling That Builds Slowly
Unlike a ligament tear, which often causes rapid swelling within minutes, a meniscus tear tends to swell gradually. It can take 24 hours or more for noticeable swelling to appear, especially with smaller tears. The swelling comes from fluid accumulating inside the joint, which makes the knee feel tight and stiff rather than visibly ballooned.
This delayed swelling catches many people off guard. You might injure your knee during a weekend soccer game, feel mostly fine that evening, and then wake up the next morning with a swollen, stiff knee that’s hard to fully bend. The swelling can persist for weeks if the tear goes untreated, and it often returns after physical activity even if it temporarily improves with rest.
Catching, Clicking, and Locking
These mechanical symptoms are among the most distinctive signs of a meniscus tear. When cartilage tears, a flap or loose fragment can shift out of position inside the joint. As you move your knee, this displaced piece gets caught between the bones, producing a catching or clicking sensation.
Locking is more dramatic. A locked knee will neither fully bend nor fully straighten because the torn fragment is physically blocking the joint’s movement. It feels like something is jammed inside. Sometimes you can gently wiggle or slowly extend the knee to “unlock” it, but the sensation is unsettling and tends to recur. Not every meniscus tear causes locking, but when it happens, it strongly suggests a displaced tear that may need surgical repair.
You might also notice a giving-way sensation, where the knee feels unstable or like it could buckle. This happens because the damaged meniscus can no longer stabilize the joint effectively during weight-bearing movements.
Bucket-Handle Tears: More Severe Symptoms
A bucket-handle tear is a specific pattern where a large portion of the meniscus flips into the center of the knee joint, like the handle of a bucket folding over. This type produces more intense symptoms:
- Inability to straighten the leg completely, because the displaced cartilage physically blocks extension
- A popping sound at the time of injury
- Persistent locking that doesn’t resolve with gentle movement
- Significant pain and stiffness that develops quickly
Bucket-handle tears generally don’t improve on their own. The separated piece of cartilage is stuck in the middle of the joint, and it can’t move back or heal without surgical intervention. If your knee locks and you physically cannot straighten it, that warrants prompt evaluation by an orthopedic specialist, since leaving the tear untreated raises the risk of cartilage damage and early osteoarthritis.
Acute Tears vs. Degenerative Tears
The way symptoms start tells you a lot about what kind of tear you’re dealing with. Acute tears happen suddenly, usually during sports or physical activity involving twisting, pivoting, or a hard stop. You might feel a pop, followed by pain and swelling that builds over the next day. These are more common in younger, active people.
Degenerative tears develop gradually as the meniscus weakens with age. After about 40, the cartilage becomes less flexible and more prone to fraying. You might not recall any single injury. Instead, you notice increasing knee pain and stiffness over weeks or months, possibly triggered by something as minor as squatting in the garden or stepping off a curb. The pain tends to come and go, worsening with activity and improving with rest, which makes it easy to dismiss as general “knee trouble.”
Degenerative tears are extremely common. Many people over 50 have meniscus tears visible on MRI without experiencing any symptoms at all. The presence of a tear on imaging doesn’t automatically mean it’s the source of your pain, which is why doctors typically rely on physical examination findings alongside MRI results.
How a Meniscus Tear Is Diagnosed
Diagnosis usually starts with a physical exam. Your doctor will press along the joint line of your knee to check for tenderness and perform specific tests that stress the meniscus. The McMurray test involves bending and rotating your knee while the examiner feels for clicking or pain. Another common test, the Thessaly test, has you stand on the affected leg with a slight knee bend and rotate your body. Both are useful screening tools, though neither is perfectly accurate on its own.
MRI is the most sensitive imaging test for confirming a meniscus tear. It can show the size, location, and pattern of the tear, which helps determine whether it’s likely to heal with rest or needs surgical attention. MRI does have a notable false-positive rate, meaning it sometimes flags abnormalities that aren’t causing symptoms. That’s why the clinical picture, your symptoms and exam findings, matters as much as what the scan shows.
Symptoms That Mimic a Meniscus Tear
Several other knee problems produce similar symptoms, which is why diagnosis isn’t always straightforward. A ligament sprain can cause swelling and instability. Early arthritis produces joint-line pain and stiffness. A loose body (a small fragment of bone or cartilage floating in the joint) can mimic the catching and locking of a meniscus tear.
One useful distinction: meniscus tears tend to cause pain that is very localized to one side of the knee and worsens specifically with twisting or squatting. If your pain is more diffuse, located behind the kneecap, or triggered mainly by stairs and prolonged sitting, a different condition may be responsible. Accurate diagnosis depends on putting the full picture together: your symptoms, how they started, what makes them worse, and what the imaging shows.