The meniscus is fibrocartilage 2 crescent, articular surface located in the medial and lateral tibial plateau. The cross section is triangular, thick thin, slightly concave above, in order to coincide with the femoral condyle, the flat, connected with the tibial plateau. This structure is to form a deep femoral condyle in the tibia platform, so that the stability of the spherical femoral condyle and tibial plateau. Meniscus front end is respectively attached in the middle part of non articular surface of tibial plateau region, in the intercondylar eminence front and rear. This part can be called meniscus before and after angle.
Meniscus edge thicker, closely connected with the joint capsule, center of thin, a free state. The medial meniscus presented "C" shape, and anterior angle adhered to the anterior cruciate ligament before attachment point, the posterior angle adhered to the adhesion between cruciate ligament tibial intercondylar eminence and the point after, the outer edge of the central and medial collateral ligament connected the lateral meniscus presented "O" shape, the anterior angle adhered to the anterior cruciate ligament attachment point before, before the posterior angle adhered to the posterior horn of the medial meniscus, its outer edge and the lateral collateral ligament is not connected, the activity is the medial meniscus is large.
Meniscus of knee joint motion and with a certain mobile, extension of knee meniscus moves forward, knees when moving backward. The meniscus is a fiber cartilage, which itself has no blood supply, its nutrition from synovial fluid, boundary level part only is connected with the joint capsule and get some blood supply from the synovial membrane.
Say simply, the function of meniscus is to stabilize the knee joint, the spread of knee load force, promote joint nutrition. It is because of the stable load meniscus plays, to ensure the long-term weight-bearing knee motion without damage.
In the non weight bearing, no contact between the tibia and femur, the meniscus liner both. In weight, about 70% of the weight-bearing region in the meniscus, which greatly reduces the stress on the tibial plateau, thereby protecting the cartilage and joints.
2, maintain a knee joint motion coordination
Meniscal movement along with the tibia, medial meniscus is lateral meniscus displacement is small, and the meniscus in knee flexion can be deformed in order to adapt to the anatomy of knee extensor process. Keep the coordination of knee joint geometry, thus maintaining a knee joint motion coordination.
3, to maintain a stable
Meniscectomy in anterior cruciate ligament integrity, do not cause anterior translation of the tibia, while in the anterior cruciate ligament rupture, caused a greater degree of anterior tibial translation.
4, shock absorption
There are some knee pain patients, arthroscopic pathologic has not found any abnormal situation, and its symptoms, after inspection found the meniscus poor absorption.
5, lubricating joint
In addition the meniscus and lubricating joints, synovial fluid meniscus can be evenly coated on the articular surface, the friction coefficient of joint is greatly reduced.
Meniscus injury occurs after joint pain, knee joint activities is limited, with the passing of time will appear muscle atrophy, will appear at the same time walking rupture due to long-term wear or acute injury of meniscus and inconvenience, which partially or completely lost its original function, resulting in difficulties in walking. Prevention, symptoms, and timely to the regular hospital department of orthopedics for treatment, to avoid missed the best period of rehabilitation.