The knee joint has three bones, the femur, tibia and patella. The long upper bone called the femur is joined to the tibia by a ligament called cruciate ligament. Around the joint is a cartilage called meniscus that cushions the joint against shock or force exerted on the joint. The small bone moving up and down when the knee flexes is called the patella. The joint is surrounded with nerves that relay messages to the brain. When this joint is affected by either disease or trauma, the affected...

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