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The meniscus is a C-shaped pad of cartilage in the knee that acts as a shock absorber. Each knee has two menisci, which are essential for preserving knee health. The medial meniscus is on the inside of the knee, while the lateral meniscus sits on the outside. The meniscus is prone to tearing, especially during sports activities or other knee trauma, such as twisting injuries. This is a common injury, affecting approximately 1 million people in the US each year.
| Characteristics | Values |
|---|---|
| Definition | The meniscus is a C-shaped or crescent-shaped pad of cartilage in the knee that acts as a shock absorber. |
| Location | The meniscus is located between the tibia (shinbone or lower leg bone) and the femur (thighbone). |
| Number | There are two menisci in each knee. |
| Types of Tears | Acute tear, degenerative tear |
| Symptoms of Tear | Pain, swelling, stiffness, limited range of motion, locking, clicking, weakness, instability, catching, or a feeling of the knee "giving way" |
| Treatment | Rest, ice, medication, exercises, arthroscopy, surgery |
| Prevention | Regular exercises, light activities as warm-up, rest between workouts, properly fitting shoes, flexibility training, gradual increase in workout intensity |
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What You'll Learn
The meniscus is a pad of cartilage in the knee
The meniscus is a C-shaped or crescent-shaped pad of cartilage in the knee that acts as a shock absorber. Each knee has two menisci, which sit between the tibia (shinbone or lower leg bone) and the femur (thighbone). The medial meniscus is on the inside of the knee, while the lateral meniscus sits on the outside. The menisci are made of smooth, flexible, rubbery cartilage that cushions the joint and protects the bones from wear and tear.
Meniscus tears are very common knee injuries, particularly for athletes. They often occur during sports activities that involve twisting, rotating, or pivoting the knee while bearing weight. Tears can also result from hard impacts, such as tackles or other physical contact. In older adults, degeneration of the cartilage in the knee, also known as osteoarthritis, can weaken the meniscus and make it more susceptible to tearing, even without athletic activity or strain.
The most common symptoms of a meniscus tear include joint pain and stiffness, swelling, limited range of motion, and knee joint locking, clicking, or a feeling of the knee "giving way". Treatment for a torn meniscus depends on the severity of the injury and can range from conservative approaches such as rest, ice, medication, and physical therapy to more invasive procedures like knee arthroscopy or surgery.
It is important to note that meniscus tears can be challenging to prevent, as they often result from accidents or acute trauma. However, certain precautions can help lower the risk of injury, such as regular exercise to strengthen thigh muscles, proper warm-up routines, adequate rest between workouts, wearing well-fitting and supportive shoes, and gradually progressing the intensity of workouts.
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Meniscus tears are common knee injuries
The meniscus is a C-shaped or crescent-shaped pad of cartilage in the knee that acts as a shock absorber. Each knee has two menisci, which sit between the tibia (lower leg bone) and the femur (thigh bone). The medial meniscus sits on the inside of the knee, while the lateral meniscus is on the outside.
Meniscus tears are very common knee injuries, especially for athletes. They are usually caused by a twisting movement of the knee while bearing weight, such as when twisting the upper leg while the foot stays in place. This can happen during sports or other activities, and the risk is particularly high for athletes who participate in contact sports, such as football, or activities that involve pivoting, such as tennis or basketball. Meniscus tears can also occur from minor injuries, such as twisting when standing up, or even from degenerative changes that happen over time as people age.
The symptoms of a meniscus tear include pain, swelling, and stiffness in the knee. There may also be a feeling of the knee giving way, an inability to move the knee as usual, or a catching or clicking sensation. Symptoms may take 24 hours or more to develop, especially if the tear is small.
Treatment for a meniscus tear depends on the size and location of the tear, as well as the patient's age, general health, and activity level. Conservative treatment, such as rest, ice, medication, and physical therapy, may be enough to relieve the pain and allow the injury to heal on its own. In some cases, however, surgery may be required. Knee arthroscopy, a minimally invasive procedure, is often used to treat meniscal tears. During this procedure, a small, lighted optic tube is inserted through a small incision in the joint to project images of the inside of the knee onto a screen, allowing the doctor to repair or trim out the torn portion of the meniscus.
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Symptoms of a meniscus tear
The meniscus is a C-shaped pad of cartilage in the knee that acts as a shock absorber. Each knee has two menisci. A torn meniscus is one of the most common knee injuries. Any activity that causes you to forcefully and suddenly twist or rotate your knee, especially when putting your full weight on it, can lead to a torn meniscus. The risk is particularly high for athletes, especially those who participate in contact sports, such as football, or activities that involve pivoting, such as tennis or basketball.
- Pain in the knee joint: usually on the inside (medial) or outside (lateral) of the knee. It might take 24 hours or more for pain to begin, especially if the tear is small.
- Swelling of the knee.
- Weakness or instability of the knee.
- Stiffness of the knee.
- A feeling of the knee giving way.
- Inability to move the knee as you usually do.
- Locking or clicking of the knee.
If you suspect a torn meniscus, contact your doctor, who will determine the best course of treatment. Conservative treatment, such as rest, ice, and medication, is sometimes enough to relieve the pain and give the injury time to heal on its own. In other cases, surgery is required.
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Treating a torn meniscus
A torn meniscus is one of the most common knee injuries, often caused by a twisting movement of the knee while bearing weight. The meniscus is a C-shaped pad of cartilage in the knee that acts as a shock absorber. When the knee is sharply pivoted or rotated, the meniscus can tear. This can lead to pain, swelling, or instability in the knee.
If you suspect a torn meniscus, it is important to seek medical attention. A doctor will be able to diagnose the injury and determine the appropriate treatment plan. In the meantime, you can try conservative treatment at home, such as rest, ice, and over-the-counter pain medication, to help relieve pain and reduce swelling. It is important to avoid any activities that may aggravate the injury and to allow the knee to rest.
The treatment for a torn meniscus will depend on the severity of the injury, the patient's age, and their general health. Small tears may heal with self-help methods such as rest, ice, and over-the-counter pain relievers. Physiotherapy may also be recommended to reduce pain and improve movement and strength in the knee.
For larger tears, surgery may be necessary. Knee arthroscopy, a minimally invasive procedure, is often used to repair or trim the torn portion of the meniscus. During this procedure, a small, lighted optic tube is inserted through a small incision in the joint, allowing the doctor to repair or remove the damaged cartilage. After surgery, physiotherapy is usually recommended to help restore knee strength and stability.
It is important to follow the advice of a medical professional when treating a torn meniscus. With proper care and treatment, most people can make a full recovery.
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Meniscus degeneration
The meniscus is a C-shaped or semicircular pad of fibrocartilage in the knee that acts as a shock absorber. Each knee has two menisci, with one on the inside of the knee (medial) and one on the outside (lateral). The menisci sit between the tibia (lower leg bone) and the femur (thigh bone) and protect the lower part of the leg from the shock created by our body weight.
The meniscus degenerates microscopically and macroscopically with the aging process, resulting in pain and knee dysfunction. Degenerative meniscal tears are generally atraumatic and a normal part of aging. They are typically observed in middle-aged or older people. Tears are often associated with knee osteoarthritis and degenerative changes. The medial meniscus is most commonly torn.
There is no one specific cause of degenerative meniscal tears. They are probably an early sign of osteoarthritis, rather than a completely separate diagnosis. However, a lot of middle-aged and older people have degenerative meniscal tears without knee pain, because changes within the menisci are perfectly normal age-related changes and responses that happen within the knee as we get older.
While there is no one cause, there are a range of contributory factors that may increase the risk of developing degenerative meniscal tears. Magnetic Resonance Imaging (MRI) research studies report a 35% prevalence of degenerative meniscal tears in people over 50 years of age. Most of these meniscal tears are asymptomatic, meaning the person has no pain or symptoms.
Treatment of degenerative meniscus tears depends on the patient's symptoms, age, and general health. Conservative treatment with anti-inflammatory medications and physical therapy may provide pain relief and improve mechanical knee function. For patients refractory to conservative therapy, arthroscopic partial meniscectomy can provide short-term pain relief when combined with a physiotherapy program. However, surgery is not a guaranteed success, especially in the presence of articular pathology.
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Frequently asked questions
A meniscus is a piece of cartilage in a joint that provides cushion where two bones meet. In the knee, two C-shaped menisci protect the area between the upper and lower leg bones.
A torn meniscus can cause pain, swelling, stiffness, weakness, and instability in the knee. The knee might also feel locked or buckled, and there may be an audible clicking sensation.
A meniscus tear is often caused by a twisting movement of the knee while bearing weight. It can also be caused by degeneration of the meniscus due to aging or osteoarthritis.
Treatment for a meniscus tear depends on the severity of the injury. Conservative treatments such as rest, ice, medication, and physical therapy may be enough for the injury to heal on its own. In more severe cases, surgery may be required.
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