The inner two-thirds of the meniscus is what we consider avascular, where minimal to no blood supply reaches the tissue. The picture below shows zones where the blood flow is present and where the blood flow is very limited (they use the terms red and white zone to determine circulation).
Which part of the meniscus is most vascular?
Various zones of the meniscus are described based on the blood supply; the red zone is the well-vascularized periphery, the red-white zone is the middle portion with vascularity peripherally but not centrally, and the white zone is the central avascular portion.
What area of the meniscus has a blood supply?
The anterior and posterior homs of the menisci have a rich supply of both blood vessels and nerves.
Does meniscus have blood flow?
The blood flow to the meniscus is very poor. Blood is what brings nutrients, growth factors and cells to the meniscus and allow it to heal. Since the meniscus has a limited blood supply, certain parts of the meniscus are more likely to heal tears and other areas can never heal.Does the medial meniscus have a blood supply?
Vascular Anatomy The meniscus is a relatively avascular structure with a limited peripheral blood supply. The medial, lateral, and middle geniculate arteries (which branch off the popliteal artery) provide the major vascularization to the inferior and superior aspects of each meniscus (Figure 5).
What part of the meniscus do not receive any blood supply?
There is not much blood supply to the menisci. Blood flows only to the outer edges from small arteries around the joint. The poor blood supply to the inner portion of the meniscus makes it difficult for the meniscus to heal.
What is the meniscus considered?
The menisci — the medial meniscus and lateral meniscus – are crescent-shaped bands of thick, rubbery cartilage attached to the shinbone (tibia). They act as shock absorbers and stabilize the knee. The medial meniscus is on the inner side of the knee joint. The lateral meniscus is on the outside of the knee.
What muscles attach to the meniscus?
The menisci also attach to leg muscles which help the menisci maintain their position during movement. The semimembranosus and quadriceps attach to both menisci. The lateral meniscus attaches to the popliteus below the knee and the femur via the posterior cruciate ligament (PCL).How many meniscus are in the knee?
The meniscus is a c-shaped pad of cartilage in the knee that acts as a shock absorber. Each knee has two menisci.
How can I increase blood flow to my meniscus?Gentle massage around the injured knee area or small flexing or extending knee movements (if not painful) will also help increase blood flow, oxygen, nutrients, and will prevent stiffness.
Article first time published onIs a medial meniscus tear in the red zone or white zone?
Tears at the outer edge of the meniscus (the red zone) tend to heal well. Blood supply to tears that extend into the center of the meniscus (white zone) is questionable, and surgical repair of a tear in this zone may not heal well.
Is the knee meniscus innervated?
NERVE SUPPLY: The horns of the menisci and the peripheral vascularized portion of the meniscal bodies are well innervated with free nerve endings (nociceptors) and three different mechanoreceptors (Ruffini corpuscles, pacinian corpuscles, and Golgi tendon organs).
Which is worse lateral or medial meniscus tear?
Is the lateral meniscus tear worse than a medial meniscus tear? It is hard to differentiate what type of tear is worse if it is repairable. However, it is well known that if a lateral meniscus is taken out, the consequences are almost always worse than having a medial meniscus resected.
Can a torn meniscus get worse over time?
Pain and swelling are common symptoms of a torn meniscus. You’ll most likely know if you have a torn meniscus. People usually feel pain, but can still walk. Sometimes swelling also occurs and it may get worse over time.
What is the red zone in a meniscus tear?
The red zone refers to the outer third of the meniscus. The term red is used to signify that this zone receives some degree of a blood supply. Meniscal tears in this zone can often be repaired. This is in contrast to the white zone, which refers to the inner two-thirds of the meniscus.
Is meniscus made of collagen?
The meniscus is composed of fibrochondrocytes with few myofibroblasts and endothelial cells. The matrix is predominantly composed of collagen type I with minor amount of other collagen types and elastin. The oriented collagen fibers and the proteoglycans contribute to the load transmission and compression resistance.
Does meniscus have nerve endings?
Because the menisci have no nerve endings, pain associated with a tear is actually due to swelling and injury to the surrounding tissue.
Is meniscus a tendon or ligament?
Four ligaments, which are tough cords of tissue, connect the thigh bone, or femur, to the lower leg bones, called the tibia and fibula. These ligaments keep the knee stable when a person walks, jumps, bends, or pivots. In between the femur and tibia is a thick layer of smooth cartilage called the meniscus.
Why is medial meniscus more prone to injury?
The medial meniscus is more vulnerable to injury to due to its intimate attachment to the medial collateral ligament. The moveable lateral meniscus is less prone to tear except when the ACL is injured.
What can mimic a medial meniscus tear?
Normal anatomic structures that can mimic a tear include the meniscal ligament, meniscofemoral ligaments, popliteomeniscal fascicles, and menisco- meniscal ligament. Anatomic variants and pitfalls that can mimic a tear include discoid meniscus, meniscal flounce, a meniscal ossicle, and chondrocalcinosis.
How do I know if my meniscus is severity?
- a “pop” in the knee when the tear occurs.
- pain in the center or side of the knee, especially when twisting the knee or squatting. …
- swelling and stiffness in the knee that gets worse over the first 2 or 3 days after the injury occurs.
- limited range of motion.
Why does my torn meniscus hurt at night?
There are a couple of reasons why your knee pain is worse at night: Pain is perceived to be worse at nighttime. As you climb into bed and start to quiet your mind pain becomes more pronounced than when you were active during the day distracted by your activities. An active day may cause your knee joint to swell.
Is meniscus and MCL the same thing?
MCL stands for medial collateral ligament and is located on the inside of the knee. The MCL originates on the femur (thigh bone) and inserts on the tibia (large bone of the lower leg). The MCL splits slightly at the knee joint and some fibers also insert onto the medial meniscus (cushion inside the knee).
What percent of meniscus tears require surgery?
Less than 10 percent of meniscal tears occurring in patients age 40 or older can be repaired. This is often because the tissue degeneration affects blood flow to the cartilage, making healing less likely after surgery. A doctor may recommend removing the damaged tissue and suggest physical therapy exercises.
Can a meniscus be repaired twice?
If a patient underwent a surgical meniscus repair and still experiences pain and swelling, or if a patient re-tears the cartilage, a revision meniscus repair may be necessary.
Can the meniscus move out of place?
Treatment For A Meniscus Tear If left untreated, a meniscus tear may result in a portion of the cartilage becoming loose and moving into the joint, causing the knee to slip out of place. Treatment usually depends on the severity of the tear and its exact location.
What causes meniscus degeneration?
The most common cause of meniscus tears is age related degeneration. As we age, the connections between the collagen fibers that make up the meniscus begin to deteriorate, causing failure of the structure and tears due to stresses in the joint. Often these tears can occur with minimal load and trauma.
Does Popliteus attach to meniscus?
The popliteus muscle is a flexor of the knee joint and its tendon is attached to the posterior part of the lateral meniscus.
Is the knee meniscus a muscle?
The meniscus is a piece of cartilage that provides a cushion between your femur (thighbone) and tibia (shinbone). There are two menisci in each knee joint. They can be damaged or torn during activities that put pressure on or rotate the knee joint.
How can I increase blood flow to my rotator cuff?
Try to regain normal pain free range of motion by performing gentle stretching exercises while lying down or with help from your other arm. Perform gentle isometrics. Isometric exercises that target the rotator cuff are a safe way to improve blood flow, increase muscle strength and reduce swelling.
How do you heal a torn meniscus naturally?
- Rest the knee. …
- Ice your knee to reduce pain and swelling. …
- Compress your knee. …
- Elevate your knee with a pillow under your heel when you’re sitting or lying down.
- Take anti-inflammatory medications. …
- Use stretching and strengthening exercises to help reduce stress to your knee.
