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The knee joint joins the thigh with the leg and consists of two articulations: one between the femur and tibia, and one between the femur and patella.[1] It is the largest joint in the human body.[2] The knee is a mobile trocho-ginglymus (a hinge joint),[citation needed] which permits flexion and extension as well as slight internal and external rotation. The knee joint is vulnerable to both acute injury and the development of osteoarthritis.