The menisci are rubbery cushions that lie in the knee between the major bones of your knee, acting like shock absorbers. If you tear a meniscus, your knee will swell and become painful. You may feel that the initial pain has gone away, but an aching pain will return which will be particularly noticeable if you run or twist or flex the knee. Depending on which meniscus you tear, the pain could be on the inner or the outer knee. The pain may be worse at night.
Your knee may also click or ‘lock’ - this means you cannot straighten you knee. If your knee is locked you will need urgent medical attention. Left untreated a torn meniscus could lead to damage to the articular cartilage in your knee.