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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 are located between the tibia (lower leg bone) and the femur (thigh bone). The medial meniscus is on the inside of the knee, while the lateral meniscus is on the outside. The menisci help to disperse friction and weight in the knee joint, protecting the lower part of the leg from the shock of body weight. Meniscus tears are common knee injuries, often caused by twisting or rotating movements while bearing weight. Symptoms of a torn meniscus include pain, swelling, stiffness, and weakness of the knee. Treatment options depend on the type and severity of the tear and may include conservative management, physical therapy, or surgical repair or removal.
| Characteristics | Values |
|---|---|
| Shape | C-shaped or crescent-shaped |
| Location | Knee, wrist, acromioclavicular, sternoclavicular, and temporomandibular joints |
| Composition | Fibrocartilaginous tissue |
| Blood Flow | From the periphery (outside) to the central meniscus |
| Function | Provides structural integrity to the knee, disperses friction, acts as a shock absorber, and cushions the joint |
| Injuries | Tears, which can be acute or chronic |
| Treatment | Conservative management, arthroscopy, or surgery |
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What You'll Learn
The meniscus is a C-shaped piece of cartilage in the knee
The meniscus is composed of two pads of fibrocartilaginous tissue, which disperse friction in the knee joint. These pads are concave on top and flat on the bottom, articulating with the tibia. They are attached to the small depressions (fossae) between the condyles of the tibia (intercondyloid fossa). The menisci also help to stabilise the knee joint, providing support and distributing weight evenly.
A tear in the meniscus is a very common knee injury, especially among athletes. It can be caused by sudden, twisting movements, such as pivoting or stopping and turning suddenly. It can also be caused by kneeling, deep squatting, or lifting heavy objects. In older adults, degenerative changes in the knee can contribute to a torn meniscus with little or no trauma.
Symptoms of a torn meniscus include pain, swelling, and stiffness. The patient might also feel a block to knee motion and have trouble extending their knee fully. Treatment for a torn meniscus depends on the patient's age and the severity of the tear. Conservative treatment, such as rest, ice, and medication, may be enough to relieve the pain and allow the injury to heal on its own. In other cases, surgery may be required.
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Meniscus tears are a common knee injury
The meniscus is a C-shaped or crescent-shaped piece of fibrocartilage in the knee. It is a crucial structure as it acts as a shock absorber and provides cushioning between the femur and tibia (thighbone and shinbone). The meniscus also helps to stabilise the knee joint and protects the hyaline cartilage that lines it.
Meniscus tears are a very common knee injury, especially among athletes. They are often caused by sudden twisting movements, such as those that occur in sports like tennis, soccer, and basketball. The risk of a meniscus tear is higher in older individuals due to age-related cartilage degeneration, and in those with arthritis. People with arthritis are more prone to meniscus tears as the condition involves the breakdown of cartilage in the joints.
The symptoms of a meniscus tear include pain, swelling, and the feeling of the knee locking up or giving way. Diagnosis of a meniscus tear involves a thorough physical examination, including checking for tenderness along the joint line. Further tests such as X-rays and MRI scans may also be ordered to rule out other issues and evaluate the extent of the tear.
Treatment options depend on the severity of the tear and can range from conservative management, such as rest, ice, compression, and elevation, to surgery in more serious cases. Small tears often heal on their own, while larger tears may require arthroscopic surgery. Physical therapy is often recommended to strengthen the knee and improve range of motion.
To prevent meniscus tears, it is important to strengthen the muscles supporting the knee and ensure proper footwear and gradual progression in exercise intensity.
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The meniscus safeguards the hyaline cartilage
The meniscus is a C-shaped or crescent-shaped piece of soft, rubbery fibrocartilage in the knee. It acts as a shock absorber and provides a cushion between the tibia and femur. The meniscus is essential to the health of the knee and the prevention of arthritis.
The meniscus pads protect against osteoarthritis and hyaline cartilage degeneration. They allow the knee to bend and straighten without the femur and tibia rubbing together. The menisci also relieve weight-bearing stress on the knees. They provide support while compressing and distributing the load evenly within the knee. When weight is placed on a meniscus, it compresses and extends to provide stability.
The meniscus is susceptible to injury, especially among athletes. Sudden, twisting movements can tear the meniscus. Tears can be acute, often the result of trauma or sports injury, or chronic, wear-and-tear type tears. Acute tears have many different shapes and sizes and are often treated with surgical repair. Chronic tears are treated with physical therapy, with or without injections and anti-inflammatory medications.
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The meniscus acts as a shock absorber
The meniscus is a C-shaped or crescent-shaped fibrocartilage in the knee. It is also found in the wrist, acromioclavicular, sternoclavicular, and temporomandibular joints. The term "meniscus" comes from the Ancient Greek word "meniskos", which means "crescent".
The meniscus is commonly injured during sports, with tears occurring due to sudden, twisting movements. These tears can cause pain and swelling, and may require surgical repair or physical therapy for treatment. The meniscus has poor blood supply, which can make healing difficult.
Despite the frequent association of the meniscus with shock absorption, some studies have questioned this function. These studies suggest that the menisci release energy back into the knee rather than dissipating it, which would be expected for a shock absorber. However, other studies have provided evidence of the meniscus's shock-absorbing abilities, indicating that it may play a role in impact and sinusoidal load absorption.
In summary, the meniscus is a crucial structure in the knee joint that provides cushioning, support, and stability. Its role in shock absorption has been debated, with conflicting evidence from various studies. Further research is needed to fully understand the function of the meniscus and its impact on knee joint mechanics.
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The meniscus is essential for knee stability
The meniscus is a C-shaped piece of cartilage in the knee. Each knee joint has two wedge-shaped pieces of soft cartilage that make up the meniscus. The medial meniscus is on the inside of the knee, while the lateral meniscus is on the outside. The menisci are also known as "semi-lunar" cartilages, referring to their half-moon, crescent shape. The word "meniscus" comes from the Greek word "mēniskos", meaning "crescent".
The menisci increase stability for femorotibial articulation, distribute axial load, absorb shock, and provide lubrication and nutrition to the knee joint. The menisci play a vital role in attenuating the intermittent shock waves generated by impulse loading of the knee with a normal gait. Voloshin and Wosk showed that the normal knee has a shock-absorbing capacity about 20% higher than knees that have undergone meniscectomy. As the inability of a joint system to absorb shock has been implicated in the development of osteoarthritis, the meniscus plays an important role in maintaining the health of the knee joint.
The meniscus is also important in resisting anterior tibial force. Markolf and colleagues found that medial meniscectomy in the ACL-deficient knee resulted in an increase in anterior-posterior tibial translation of up to 58% at 90 degrees of flexion. This confirms the important role of the medial meniscus in knee stability.
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Frequently asked questions
The meniscus is located in the knee.
The meniscus is a C-shaped or crescent-shaped pad of cartilage in the knee joint.
The meniscus acts as a shock absorber, cushioning the lower part of the leg from the weight of the rest of the body and reducing friction during movement.
A torn meniscus is a common injury that can cause pain, swelling, stiffness, and weakness in the knee. Treatment options include rest, ice, medication, physical therapy, and in some cases, surgery.
