A meniscus injury develops when there is damage to the special cartilage that lines the knee joint.
Meniscus tears may develop suddenly due to an injury, or come on gradually over time due to wear and tear.
The most common meniscus tear symptoms are knee pain, swelling, stiffness, instability and sometimes locking - where the knee gets stuck in one position.
It can take a long time to recover from a torn meniscus as the blood supply to the region is generally poor, resulting in slow healing.
Here, we will look at the causes and different types of cartilage injuries as well as common meniscus tear symptoms and treatment options.
The knee meniscus is made up of thick, crescent shaped bits of cartilage that line the knee on either side of the joint.
There are two parts, the medial
meniscus, on the inner side of the knee and lateral meniscus, on the
outer side of the knee.
The meniscus acts as a shock absorber and ensures there is correct weight distribution through the knee.
Medial meniscus tears are the most common as more force tends to go through the inner side of the knee, resulting in medial knee pain.
A meniscus injury may be caused by:
A meniscus injury usually happens during sporting activities e.g. football, rugby and skiing.
Meniscus tears typically occur when the foot is fixed, e.g. studs in the ground, and the knee is slightly bent and then twisted by a sudden turn initiated either by you or by a force to the outside of the knee.
Medial meniscus tears are more common than lateral meniscus tears and often the medial collateral ligament (MCL) is injured at the same time – see MCL Tear.
Wear and tear at the knee joint associated with aging can also cause a meniscus injury. Cartilage tends to become more brittle with age and everyday use of the knee can result in meniscus tears. Often this affects the edges of the meniscus which get frayed and torn.
Symptoms of meniscus wear and tear may gradually build or they may be triggered by a particular event e.g. twisting the knee awkwardly. Meniscal tears are also a common feature of knee arthritis.
There are four different types of meniscus tear which you can see illustrated in this diagram:
The three most common meniscus tear symptoms are:
With a meniscus injury there is often a lot of pain in the knee, especially when trying to straighten the leg fully or when bearing any weight though it. Activities such as coming down stairs and squatting down are often painful.
If you can do a full squat, where your buttocks touch your heels, and there is no pain, it is unlikely you have a cartilage problem. As most meniscus injuries affect the medial knee meniscus, they frequently cause medial knee pain.
Swelling usually develops gradually over the first 48 hours after a meniscus injury. The amount of swelling will depend on the severity and location of the injury.
If there is ongoing wear and tear in the meniscus, then the amount of swelling will often fluctuate. A meniscus injury is a common cause of knee swelling.
With a more severe meniscus injury the knee may lock. This is where the joint gets stuck in one position and can’t move. A meniscus tear is the most common cause of a locked knee.
There are two different types of knee locking:
If you don't have any of these meniscus tear symptoms, it is unlikely that you have a cartilage injury. Visit the knee pain diagnosis section for help working out what else may be causing your pain.
Meniscus injury treatment usually consists of:
PRICE is the best place to start for the first few days after a mensicus injury before moving on to a rehab programme to strengthen the knee and regain any loss of movement
and function. PRICE stands for Protect, Rest, Ice, Compress and Elevate.
Visit the PRICE treatment section to find out how to use the different elements safely and effectively.
Exercises are a really important part of meniscus tear treatment. Building up the strength of the muscles surrounding the knee joint helps to reduce the amount of weight going through the knee and therefore through the cartilage, and can really help to reduce the effect of a meniscal tear.
Muscle weakness of the glutes and kneecap muscles often causes excess force to go through the medial meniscus resulting in an injury, so strengthening these muscles can particularly help.
In the meniscus injury exercises section you will find some great exercises that can really help with your meniscus tear recovery.
Ice can really help to reduce the pain and swelling associated with a meniscus injury which helps to speed up healing. By reducing the inflammatory response, you reduce the density of inflammatory chemicals that irritate the torn meniscus, making it easier for it to heal. But when used incorrectly, ice can actually make things worse.
Visit the ice treatment section for the most effective ways to apply ice.
Tubigrip is an elasticated compression bandage that can help to reduce swelling and to provide some support to the knee after a meniscus injury. However, long term use of tubigrip is not advised as it can result in weakening of the muscles.
Visit the tubigrip compression section to find out more about how it works and how to get the right size for you.
Knee braces provide much more stability than tubigrip, so can be really useful after a meniscus injury, especially if the knee feels unstable.
If exercises haven’t resolved your meniscus tear symptoms, your doctor may advise surgery. Most surgery for a meniscus injury is performed arthroscopically (keyhole surgery). This is where they make two or three small holes around the knee and a camera is inserted into the knee.
The surgeon will remove
any debris (torn bits of cartilage) and sew up tears where possible as shown in the video here from the American Academy of Orthopedic Surgeons.
The aim is to preserve as much of the
cartilage as possible since it won’t regrow. You can usually go home the same day.
Following meniscus injury surgery, it is important to exercise to regain full strength, movement and balance at the knee.
Unfortunately, torn knee cartilage is not very good at regenerating. Tissues require a good blood supply to heal and whilst blood capillaries do feed the outer edges of the meniscus, the central parts of the meniscus are avascular (have no blood supply). This means that often meniscus tears can’t properly heal.
But by building up the strength of the knee muscles, you can really reduce the symptoms of a meniscus injury and reduce the risk of further damage to the meniscus. Check out our Meniscus Injury Exercises >
Meniscus tears are a common knee problem, especially in sports or as we get older. The best way to prevent the cartilage from getting torn is to keep the knee muscles strong so the knee is well supported and less weight goes through the joint.
If a meniscus injury isn’t sounding quite like your knee pain, visit the Knee Pain Diagnosis section for help working out what is wrong.
Page Last Updated: 10/15/21
Next Review Due: 10/15/23