A torn medial meniscus is caused by a sprain of the knee joint during sports, or a sprain of the knee joint due to an external violent injury. A torn medial meniscus is often associated with tears of the medial collateral ligament and anterior cruciate ligament and can manifest as the following symptoms: i. Pain in the knee joint, which is more pronounced when the knee is moving. ii. Swelling of the knee joint. A torn meniscus can be accompanied by damage to the soft tissues around the knee joint and a small amount of blood accumulation in the joint cavity, resulting in swelling of the joint. If the meniscus is torn severely, you may experience a clicking sound when you walk. A torn medial meniscus with popping and interlocking joints often requires surgery, which can be performed arthroscopically to explore the torn meniscus and perform suturing, trimming, or partial resection depending on the condition of the torn meniscus.