The three hallmark signs of a meniscus tear are pain along the joint line (especially with twisting), swelling that develops over hours rather than minutes, and mechanical symptoms like catching or locking when you try to move your knee. Most people notice at least two of these, though the severity depends on the type and location of the tear.
Pain With Twisting or Rotating
The most common sign of a meniscus tear is pain that sharpens when you twist, pivot, or rotate your knee. It typically concentrates along the joint line, the narrow seam where your thighbone meets your shinbone. If the tear is on the inner (medial) meniscus, the pain sits on the inside of the knee. A lateral meniscus tear hurts on the outside. The pain often feels manageable when you walk in a straight line but flares during movements that involve rotation: turning to change direction, squatting, or getting in and out of a car.
Many people are surprised to learn they can still walk on a torn meniscus. Unless the knee is locked, walking, standing, sitting, and even sleeping can feel relatively normal. That’s part of what makes meniscus tears tricky. The pain comes and goes depending on how the torn fragment shifts during movement, which can make you question whether anything is really wrong.
Swelling That Builds Gradually
A torn meniscus usually produces swelling that sets in over several hours to a day or two, not within minutes. This is one way to distinguish it from a ligament injury like an ACL tear, which tends to balloon the knee almost immediately. The swelling from a meniscus tear comes from joint fluid accumulating inside the knee capsule rather than from sudden bleeding, so it builds more slowly.
The knee may feel stiff and tight rather than dramatically swollen. You might notice it most when you try to fully bend or straighten the leg. This stiffness is sometimes called “pseudo locking” because it mimics a locked knee, but it’s really the extra fluid inside the joint making it harder to move through a full range of motion. The swelling often recurs with activity and settles down with rest, creating a frustrating cycle where the knee feels better after a few days off, then puffs up again once you return to exercise.
Catching, Locking, or Giving Way
Mechanical symptoms are the most distinctive sign of a meniscus tear. These include a popping sensation at the time of injury, a catching or clicking feeling during everyday movement, and the sensation that your knee locks in place or gives way underneath you.
True locking happens when a flap of torn meniscus tissue displaces into a part of the joint where it doesn’t fit, physically blocking the knee from fully straightening or bending. This is most common with what’s called a bucket-handle tear, where a large strip of meniscus flips into the center of the joint like a handle folding over. True locking is less common than the general stiffness caused by swelling, but it’s a more urgent sign. A knee that repeatedly locks or catches needs attention because the displaced fragment can grind against the smooth cartilage surfaces nearby, accelerating joint damage over time.
The “giving way” feeling is different from the instability you’d feel with a torn ACL. With a meniscus tear, the knee momentarily buckles because pain or a shifting fragment disrupts normal movement, not because the joint itself is structurally loose.
How a Meniscus Tear Is Diagnosed
Your doctor will likely perform a few hands-on tests during a physical exam. The McMurray test, where the examiner bends and rotates your knee while feeling for a click or pain along the joint line, is one of the most commonly used. Its accuracy improves over time: when performed about a month after injury, it correctly identifies a tear roughly 80% of the time and correctly rules one out at a similar rate. In the first week, it’s more sensitive but less specific, meaning it catches most tears but also flags some knees that turn out to be fine.
An MRI is the standard imaging tool to confirm the diagnosis and show the tear’s size, shape, and location. Physical exam tests are a useful starting point, but imaging provides the detail needed to guide treatment decisions.
What Happens if You Ignore It
A small, stable meniscus tear that doesn’t catch or lock can sometimes settle down with rest, ice, and gradual strengthening. But a tear that repeatedly catches, locks the knee, or causes chronic swelling poses a longer-term risk. The torn fragment can move in and out of position during activity, scraping against the smooth articular cartilage that lines the joint surfaces. Over time, this accelerates wear and raises your risk of developing arthritis in that knee.
Treatment: Surgery vs. Rehabilitation
For traumatic tears in younger, active people, surgical repair (stitching the torn meniscus back together) preserves as much tissue as possible and protects long-term joint health. Recovery from a meniscus repair follows a structured timeline: the first three weeks focus on protecting the repair and restoring basic motion, full range of motion typically returns between six and nine weeks, and sport-specific training begins around three to five months. Most people are cleared for unrestricted activity at six months or later.
For degenerative tears, which are common in people over 40, the picture is different. A 2025 meta-analysis of six randomized trials involving over 1,100 patients found no significant difference in knee function, activity level, or pain between surgery and non-surgical management at five years. Patients who had surgery actually showed significantly higher rates of osteoarthritis progression over that period. This means that for age-related meniscus tears, a structured physical therapy program focused on strengthening the muscles around the knee is often the better first step, even when catching or locking is present.
The distinction matters. A 25-year-old who tears a meniscus playing soccer and a 55-year-old whose meniscus wears down gradually are dealing with very different injuries, and the best path forward looks different for each.