Each meniscus is fibrocartilaginous -- it consists almost entirely of white fibrocartilage. Unlike other forms of cartilage, fibrocartilage is tough and relatively inflexible, though it does retain some elasticity thanks to its composition of cartilaginous tissue and white fibrous tissue. Additionally, fibrocartilage is the only type that contains both types I and II collagen. Type I collagen is present in scar tissue and bone, while type II collagen is mostly present in cartilage.
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