The meniscus is located in a ring of fibrocartilage between the medial and lateral tibial plateaus and the medial and lateral femoral condyles. The medial C and lateral O, or medial C-shaped, anterior horn is attached to the medial aspect of the intercondylar tibial bulge and extends in an anterior medial direction to form the anterior body portion, medially to form the middle body portion, and posteriorly to form the posterior body portion. The posterior horn attaches to the posterior medial aspect of the intercondylar tibial bulge. The posterior horn of the medial meniscus is easily damaged and easily detached from the joint capsule. The medial meniscus is large and tightly attached to the deep tibial collateral ligament, and therefore has little mobility. The lateral meniscus is O-shaped and smaller. The posterior lateral meniscus is passed by the popliteal tendon, where the meniscus is not attached to the joint capsule and is more mobile, with most of the posterior horn attached to the tibia and some fibers forming the femoral ligament. The meniscus is thin in the middle and thick around the periphery, with free edges, depressed above, and narrowed anteriorly and wide posteriorly. Under MRI imaging and anatomical observation and cross-sectional views it is roughly triangular in shape, with a smooth concave femoral surface that coincides with the femoral condyles and is in close contact. The tibial facet is relatively smooth and flat and lies on the tibial plateau, with the skin of each meniscus occupying 2/3 of the articular cartilage surface of the internal and external tibial plateau. another theory, the more common meniscal deformity is called the discoid meniscus, which occurs 99% laterally and is wider, larger, and thicker than the normal meniscus. The discoid meniscus does not have the tissue structure and physiological properties of the normal meniscus, and is less resistant to impingement, making it prone to injury during sports or early degenerative tearing.