A meniscus tear is an injury to the cartilage in the knee, often caused by twisting or turning quickly, especially during sports. The meniscus acts as a cushion between the thigh bone and the shin bone, helping to stabilize the knee joint. When it tears, it can lead to pain, swelling, and difficulty moving the knee. Symptoms of a meniscus tear may include a popping sensation at the time of injury, followed by stiffness and swelling. Treatment options vary, ranging from rest and physical therapy to surgery in more severe cases. Early diagnosis and care can help restore knee function and reduce long-term issues.