A meniscus tear typically hurts along the joint line of the knee, the narrow seam where your thighbone meets your shinbone. The pain localizes to the inner side (medial), outer side (lateral), or back of the knee, depending on which meniscus is torn and where the tear occurs. Most people can point to the pain with one finger, right along that joint line, which is one of the features that distinguishes it from more diffuse knee problems.
Medial vs. Lateral Tear Pain
Your knee has two menisci, C-shaped pads of cartilage that act as shock absorbers between the bones. The medial meniscus sits on the inner side of the knee, and the lateral meniscus sits on the outer side. A tear in the medial meniscus produces pain along the inside of the knee, roughly at the level of the joint crease. A lateral meniscus tear produces pain in the same spot on the outside of the knee.
Medial tears are far more common, so most people with a meniscus injury feel pain on the inner knee. If you bend your knee to about 90 degrees and press along the gap between the bones on either side, tenderness at that specific line is one of the most reliable signs of a tear. This is exactly what a clinician checks during a physical exam.
Pain Behind the Knee
Some meniscus tears cause pain at the back of the knee rather than along the sides. Tears in the posterior horn, the back portion of the meniscus, can produce aching deep in the hollow behind the kneecap. This pain often gets worse when you bend the knee fully, like during a deep squat or when sitting cross-legged.
A meniscus tear can also lead to a fluid-filled swelling behind the knee called a Baker’s cyst. When a tear causes the joint to produce excess lubricating fluid, that fluid can accumulate in a small pouch at the back of the knee. This creates a visible bulge, a feeling of tightness, and sometimes pain that radiates down into the calf. Not everyone with a meniscus tear develops one, but if you notice swelling specifically behind the knee, this is a common explanation.
What the Pain Feels Like
The initial moment of a meniscus tear often comes with a popping sensation, though not always an audible pop. In the hours and days afterward, you may notice a sharp, localized sting along the joint line that flares with certain movements, layered on top of a deeper, more general ache around the knee. Swelling tends to develop gradually over the first 24 to 48 hours rather than instantly, which is different from a ligament tear that often swells within minutes.
Degenerative tears, which are common in people over 40, behave differently. There may be no single injury moment at all. Instead, the pain creeps in over weeks or months as the cartilage wears down, producing a dull ache along the joint line that worsens with activity and improves with rest.
Movements That Make It Worse
Meniscus pain is heavily tied to specific motions. Twisting or pivoting on a planted foot is the classic trigger, which is why the injury is so common in sports like basketball and soccer. Deep squatting, kneeling, and going up or down stairs tend to reproduce the sharp joint-line pain because these movements compress the meniscus between the bones.
Two mechanical symptoms separate a meniscus tear from many other knee injuries. The first is locking: the knee suddenly gets stuck and you temporarily cannot straighten it, usually because a torn flap of cartilage has wedged between the joint surfaces. The second is giving way, where the knee buckles unexpectedly during walking or standing. Catching or clicking during movement is also common. If you have joint-line pain combined with any of these mechanical symptoms, a meniscus tear is high on the list of likely causes.
Pain at Night and During Rest
Many people find that meniscus pain gets worse at night, especially after an active day. Part of this is physical: lying flat can change the pressure distribution in the joint, and rolling onto the affected side puts direct contact on the sore knee. Part of it is also perceptual. Without daytime distractions, your brain focuses more on the discomfort.
If nighttime pain is an issue, sleeping on your back with a pillow under the knee and two pillows under the ankle to create a gentle ramp can help. Side sleepers do best on the uninjured side with a pillow between the knees, which prevents the injured knee from pressing against the other leg.
How It Differs From Arthritis Pain
Distinguishing a meniscus tear from knee arthritis can be genuinely difficult, especially in people who already have some joint wear. Both conditions produce pain that localizes to the side of the injury and can be felt along the joint line or diffusely through the knee. The key difference is mechanical symptoms. Catching, locking, and sudden giving way point toward a torn meniscus or a loose fragment of cartilage rather than arthritis alone. Arthritis pain tends to be more consistent, worsening gradually with activity and improving predictably with rest, without the unpredictable locking or buckling episodes.
In many people over 50, both conditions coexist. Worn cartilage is more prone to tearing, and a tear accelerates further wear. If your pain shifted suddenly from a background ache to something sharper and more mechanical, a new tear on top of existing arthritis is a common explanation.