A meniscus tear can be further determined by history, symptoms, physical examination, and MRI. 1. History: Meniscal tears usually have a clear history of trauma. Meniscus tears are often caused by traumatic injury and are often seen during rotational maneuvers with the knee half-flexed. 2. Symptoms: A meniscus tear can cause pain and swelling in the knee joint. The symptoms of knee joint interlocking card, kabe, and limp leg will appear when you move. 3. Physical examination: During physical examination, the Mai’s sign of the knee joint is positive, there may be fluid in the knee joint, the floating patella test is positive, and the movement of the knee joint may be limited. 4. MRI examination: after the symptoms mentioned above, it can be further confirmed by MRI examination, which can show the meniscus injury well, and make a grade according to the MRI image to recognize the degree of meniscus tear. If you have a meniscus tear, you must go to a regular hospital for consultation and treatment, and do not treat it on your own to avoid delaying the condition.