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Knee injury is one of the most common reasons people see their doctors. Your knee is a complex joint with many components, making it vulnerable to a variety of injuries. Many knee injuries can be successfully treated with simple measures, such as bracing and rehabilitation exercises.
For other uses, see Knee (disambiguation) . 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. It is the largest joint in the human body. The knee is a mobile trocho-ginglymus (a hinge joint), 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.