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Each meniscus has an outer vascular zone (red-red zone), which has a good blood supply and healing potential as well as a central avascular zone (white-white zone), which has limited healing capability. [2] The medial meniscus is more prone to injury due to its firm attachment to the joint capsule and limited mobility.
However, the meniscus has poor blood supply, and, therefore, healing can be difficult. Traditionally it was thought that if there is no chance of healing, then it is best to remove the damaged and non-functional meniscus, although at least one study has shown that there is little significance if a meniscectomy is done for degenerative tear. [7]
Healing of the medial meniscus is generally not possible unless the patient is very young, usually <15 years old. Damage to the outer third of the meniscus has the best healing potential because of the blood supply, but the inner two thirds of the medial meniscus has a limited blood supply and thus limited healing ability.
Meniscus tears are more likely to heal on their own if they are in what physicians call the "red zone," or the outer edge of the meniscus where blood supply is present. [21] [22] More serious tears may require surgical procedures. Surgery, however, does not appear to be better than non-surgical care. [23]
The majority of the meniscus has no blood supply. As a result, if the meniscus is damaged, from trauma or with age, it is unable to undergo the body’s normal healing process. Therefore, a torn piece can begin to move inside the joint, get caught between the bones, and cause pain, swelling, and decreased mobility.
The menisci are nourished by small blood vessels, but each has a large central section which is avascular and does not get a direct blood supply. This poses a problem in a meniscus injury, as blood flow is diminished and the avascular areas tend to not heal. Injury. The tear of meniscus is among the most common knee injuries. It is usually ...
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1.2 Blood supply. 1.3 Innervation. 2 Function. 3 Additional images. 4 ... Lateral surface of lateral condyle of femur and lateral meniscus: Animation. Posterior ...