There are some ways in which you can determine if you have torn the meniscus in your knee. The following signs and symptoms are common for a torn meniscus and may require intervention by your doctor; A popping sensation Swelling or stiffness Pain, especially when twisting or rotating your knee Difficulty straightening your knee fully Feeling as though your knee is locked in place when you try to move it. Feeling of your knee giving way If your knee is painful or swollen, or you can not move your knee in the usual way, then you should seek medical attention. It may need treatment, and in some cases, surgery is the only method that can properly repair it.