Knee Meniscus

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Photo Gallery of Meniscus Tear and Torn Knee Cartilage

What is a meniscus?
There are two menisci in your knee; each rests between the thigh bone (femur) and shin bone (tibia). The menisci are made of tough cartilage and conform to the surfaces of the bones upon which they rest. One meniscus is on the inside of your knee; this is the medial meniscus. The other meniscus rests on the outside of your knee, the lateral meniscus.

What does the meniscus do?
These meniscus functions to distribute your body weight across the knee joint. Without the meniscus present, the weight of your body would be unevenly applied to the bones in your legs (the femur and tibia). This uneven weight distribution would cause excessive forces in specific areas of bone leading to early arthritis of knee joint. Therefore, the function of the meniscus is critical to the health of your knee.


 

How does the meniscus work?
The knee joint is very important in allowing people to go about performing almost any activity. The joint is made up of three bones: the femur (thigh bone), the tibia (shin bone), and the patella (knee cap). The surfaces of these bones within the joint are covered with a layer of cartilage. This important surface allows the bones to smoothly glide against each other without causing damage to the bone. The meniscus sits between the cartilage surfaces of the bone to distribute weight and to improve the stability of the joint.

What is knee cartilage? Is it the meniscus or the ends of the bone?
Both the covering of the bone within the joint and the meniscus are made of cartilage--this makes the issue a little confusing. People often say 'cartilage' to mean the meniscus (the wedges of cartilage between the bone) or to mean the joint surface (so-called articular cartilage which caps the ends of the bone).

When people talk about a cartilage tear, they a talking about a meniscus tear. When people talk about arthritis and wear of cartilage, they are talking most often about the articular cartilage on the ends of the bone. Hopefully that clears up some of the confusion.

The meniscus is C-shaped and has a wedged profile. The wedged profile maintains the stability of the joint by keeping the rounded femur surface from sliding off the flat tibial surface. The meniscus is nourished by small blood vessels, but the meniscus also has a large area in the center of that has no direct blood supply (avascular). This presents a problem when there is an injury to the meniscus as the avascular areas tend not to heal. Without the essential nutrients supplied by blood vessels, healing cannot take place.

What happens with a meniscus tear (torn cartilage)?
The two most common causes of a meniscus tear are due to traumatic injury (often seen in athletes) and degenerative processes (seen in older patients who have more brittle cartilage). The most common mechanism of a traumatic meniscus tear occurs when the knee joint is bent and the knee is then twisted.

It is not uncommon for the meniscus tear to occur along with injuries to the anterior cruciate ligament (ACL) and the medial collateral ligament (MCL)-these three problems occurring together are known as the "unhappy triad," which is seen in sports such as football when the player is hit on the outside of the knee.

What are the symptoms of a meniscus tear?
Individuals who experience a meniscus tear usually experience pain and swelling as their primary symptoms. Another common complaint is joint locking, or the inability to completely straighten the joint. This is due to a piece of the torn cartilage physically impinging the joint mechanism of the knee.

The most common symptoms of a meniscus tear are:

Knee pain
Swelling of the knee
Tenderness when pressing on the meniscus
Popping or clicking within the knee
Limited motion of the knee joint
How is the diagnosis of a meniscus tear made?
Any patient who has knee pain will be evaluated for a possible meniscus tear. A careful history and physical examination can help differentiate patients who have a meniscus tear from patients with knee pain from other conditions. Specific tests can be performed by your doctor to detect meniscus tears.

X-rays and MRIs are the two tests commonly used in patients who have meniscus tears. An x-ray can be used to determine if there is evidence of degenerative or arthritic changes to the knee joint. The MRI is helpful at actually visualizing the meniscus. However, simply 'seeing' a torn meniscus on MRI does not mean a specific treatment is needed. Treatment of meniscus tears depends on several factors, as not all meniscus tears require surgery.

Almost any knee injury can initially be treated acutely with ice packs, rest, and immobilization. These simple measures will help to decrease swelling and pain in the joint.

Your physician can use information about how the injury occurred and physical examination tests to determine the likelihood of a meniscus tear. While x-rays are usually normal with an isolated meniscus tear, the MRI evaluation will often reveal abnormalities within the meniscus.

Is surgery necessary for meniscus tears?
The next step is to determine whether or not surgery is necessary for a meniscus tear. If an individual is not a good surgical candidate or if their meniscus tear symptoms are not significant, surgery can often be delayed or avoided altogether. Many people live normal lives despite having a meniscus tear. It is only when the meniscus tear becomes symptomatic, and interferes with activities, that surgery to treat the meniscus tear should be considered.

There are generally two surgical options for treating a meniscus tear:

Meniscus Repair
A meniscus repair is a surgical procedure done to repair the damaged meniscus. This procedure can restore the normal anatomy of the knee, and has a better long-term prognosis when successful. However, the meniscus repair is a more significant surgery, the recovery is longer, and, because of limited blood supply to the meniscus, it is not always possible.

Meniscectomy
A meniscectomy is a procedure to remove the torn portion of the meniscus. This procedure is far more commonly performed than a meniscus repair. Most meniscus tears cannot be treated by a repair for a number of reasons. Often the tear is in an avascular region of the meniscus, and will not heal even if repaired. Some tears are frayed and cannot be sutured together. In these cases, the meniscectomy is done to remove the damaged portion of meniscus. The meniscectomy has a faster recovery, but it can lead to trouble years down the road because of the absence of the normal meniscus.
What is the prognosis after having sustained a meniscus tear (torn cartilage)?
With a meniscus tear (torn cartilage) in your knee, the shock absorbing capacity of the joint is threatened. Because of this, there is an increased risk of developing damage to the articular cartilage surface of the knee joint bones; this is commonly referred to as knee arthritis. Loss of the meniscus places more of a burden on the cartilage surfaces of the joint and they are more likely to develop knee arthritis. Therefore, any lifestyle changes to decrease your risk of developing arthritis can improve the prognosis after having sustained a meniscus tear. For example, weight loss, low-impact exercise, and prevention of further trauma to the joint will all improve the long-term prognosis.

If a meniscus repair is possible, the long-term prognosis, especially in younger patients, is improved due to restoration of the normal knee anatomy. However, as mentioned previously, a meniscus repair may not be possible in many patients with torn cartilage

partial meniscectomy is a surgical procedure that is performed to remove a piece of torn cartilage in the knee joint. Arthroscopic surgery is often recommended if the torn meniscus is becoming bothersome to the patient.
How is arthroscopic surgery performed?
Arthroscopic surgery is a procedure that is used to look inside a joint. Through one small incision (about 1 centimeter) a small camera, about the size of a pencil, is inserted into the joint. Then using one or more other small incisions, your surgeon places other instruments inside the knee to remove the torn cartilage.

How big are arthroscopic incisions?
Incisions for arthroscopy are quite small, usually about 1 centimeter each. The incisions are closed with one suture that is either outside or underneath the skin. A bandage is placed over the arthroscopic incisions for at least a day or two to keep the incisions sterile.

How is the damaged cartilage removed?
The torn meniscus can be removed using a number of different instruments, including small shavers and scissors. The arthroscope will also allow your surgeon to inspect the rest of the knee joint looking for signs of arthritis, loose pieces of cartilage in the knee, the ligaments of the knee, and other problems inside the joint.

Is arthroscopic knee surgery painful?
There is usually minimal pain associated with arthroscopic knee surgery. An anesthesiologist will be with you for the entire procedure to ensure you are comfortable. Following the procedure you will be given instructions on what type of pain medicine to take in you do experience discomfort. Icing the area is helpful for the first few days after surgery, as is keeping the knee elevated.

Do I need crutches after surgery?
For most arthroscopic knee procedures, crutches are given only for comfort. Once you feel steady on your feet, you can get rid of the crutches. However, there are some procedures, such as ACL reconstruction and meniscus repair, that may require longer use of crutches. Always check with your doctor before discontinuing crutch use.

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