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Other Terms: Medial meniscus of knee joint, Meniscus medialis, Ménisque médial
Lower limb joints - Knee
This is a semilunar-shaped fibrocartilaginous disc that covers about two-thirds of the medial articular surface of the tibia. Its peripheral margin is convex and thick and attaches to the fibrous membrane of the joint capsule and the tibial collateral ligament, while its free central border is thin and concave. The proximal surface is smooth and concave, while the distal surface is smooth and flat. It approximates a semicircle and has a broader peripheral to central width on its posterior half. The anterior horn tapers to attach to the tibial plateau anterior to the anterior cruciate ligament, where it blends with the transverse ligament. The posterior horn attaches to the tibial plateau posterior to the intercondylar eminence and the posterior horn of the lateral meniscus, but anterior to the posterior cruciate ligament.
Deepen the tibial surface for reception of the femur. Provide shock absorbing cushion for femorotibial compression. Probably assist in joint lubrication and facilitate sliding, rolling, and spinning movements of the joint surface.