At the time of injury, there is a self-induced tearing sensation within the knee, followed by joint pain, swelling, restricted movement, and walking limp. 1. Pain: The location of the patient’s primary pain is important in relation to the site of the meniscal injury. 2, joint locking: joint locking symptoms may occur after the injury or at the time of the injury, generally joint locking symptoms occur when the knee is straightened to 30-40°, accompanied by a popping sound. 3, loss of force symptoms: commonly known as “playing before the loss”. Meniscal injury loss of force symptoms are characterized by “sudden sensation of something sliding or rattling in the joint” when walking on an uneven road, and sudden inward or outward instability or weakness of the knee joint. 4. Joint swelling and effusion: Meniscal injury, injury to the periarticular ligaments and synovial membrane may lead to joint effusion. 5. History of multiple episodes: Meniscal tears usually do not result in loss of knee function, and patients can return to work after a considerable period of recuperation after the injury, so patients often come to the clinic after several episodes of acute symptoms and knee effusion.