The menisci are two crescent-shaped fibrocartilaginous structures in the knee between the femur and tibia that maintains knee congruity and aid in load distribution thereby sharing and distributing compressive forces across the knee joint as shock absorbers and also function to help with knee stability.
It is mainly composed of Type 1 collagen. The medial meniscus is C-shaped while the lateral meniscus is more circular and more mobile due to less capsular attachments. The discoid meniscus is an anatomical variant of the normal meniscus where the width of the meniscus is increased in size. These variants may predispose to an increased risk of injury to the menisci.