A meniscus assists with the rotational stability created by the anterior cruciate ligament. The meniscus also acts as a shock absorber. As we walk, run, and jump the knee absorbs tremendous forces. Your meniscus helps to absorb these forces so that the bone surfaces are not damaged.
The amount of force increases exponentially as the speed of movement increases from walking to running to jumping. Your meniscus helps to disperse the compressive forces over the entire knee rather than isolating them.