Depending on the level of injury, a meniscus tear can cause some or all of the following symptoms: Pain (often at the side or center of the knee and especially when twisting) Swelling Stiffness and difficulty bending and straightening the knee Movement irregularities, such as catching or locking in the knee joint A popping sensation Knee feels unstable or gives way without warning Pain can become apparent when squatting or rising from a squatting position