The knee is described as being made up of three compartments. There is the medial and lateral, or inner and outer aspects, of the knee joint itself. And then there is the space between the kneecap and the rest of the knee, the so-called patellofemoral space. Each of the medial and lateral compartments of the knee contain a meniscus. This is made up of fibro cartilage. These cartilages allow the knee to move smoothly, and they play a role in st...