Did you realize that your knees are the largest joints within the body? The joints are the lower end of the thighbone, upper end of the shinbone and the knee cap. All these are the bones that make up the entire knee joints. Bands of this connective tissue within the knees connect the bones, allowing you to move and it helps hinder any uncommon actions of your joints. The two most widespread kinds of joint discomfort are tendinitis and bursitis. Tendinitis is an infection of a tendon, while Bursitis is an inflammation of a bursa. A bursa is a fluid filled sac that forms a buffer between the bones and tendons or ligaments. It is lined with a membrane layer that lets out fluid and permits muscles, tendons and bones to slide over each other. Bursitis is most usually caused by repetitive movement.