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navel - the center point or middle of something; the Incas believed that Cuzco was the navel of the universe. navel point. midpoint, centre, center - a point equidistant from the ends of a line or the extremities of a figure.
What is the Anterior Cruciate Ligament - ACL? The anterior cruciate ligament (ACL) is one of four ligaments critical to stabilizing the knee joint. A ligament is made of tough fibrous material and functions to control excessive motion by limiting joint mobility. Of the four major ligaments of the knee, the ACL is the most frequently injured.