Knee surgery includes arthroscopies to evaluate and treat a number of conditions, or fixing cartilage tears. About your knee: “Your knee is the largest joint in your body. The knee joint is comprised of the femur, tibia and patella (knee cap). These bones are covered with surface cartilage. This cartilage acts as a “shock absorber” and allows a smooth low friction surface for the knee to move on. Between the tibia and femur lie two floating cartilages called menisci. The medial (inner) meniscus and the Lateral (outer) meniscus rest on the tibial surface cartilage and are mobile. The menisci also act as shock absorbers and stabilisers. The knee is stabilised by ligaments that are both in and outside the joint. The medial and lateral collateral ligaments support the knee from excessive side-to-side movement. The (internal) anterior and posterior cruciate ligaments support the knee from buckling and giving way. The knee joint is surrounded by a capsule (envelope) that produces a small amount of synovial (lubrication) fluid to help with smooth motion. Thigh muscles are important secondary knee stabilisers.