Symptoms of knee ligament injury mainly include knee pain, knee interlocking, knee swelling and knee movement disorder. 1. Knee pain: mild ligament injury, pain will occur during activities, and will be alleviated after resting, ligament injury is serious, there can be continuous pain, and accompanied by impaired mobility. 2. Knee interlocking: the joint is suddenly stuck in the process of flexion and extension, and the knee joint can not be straightened normally, and knee interlocking occurs because the meniscus is embedded between the joint surfaces, and can not be released. 3. Knee joint swelling: when the knee joint ligament is damaged, swelling phenomenon will appear, if the damage is light, the degree of swelling is not obvious; if the ligament is completely torn, the degree of swelling of the knee joint will also increase, and accompanied by subcutaneous ecchymosis. 4. Knee joint activity disorder: after the knee ligament injury, the ligament protection of the knee joint is weakened, the surrounding soft tissue spasm, so that the knee joint activity disorder. Knee ligament injury patients, it is recommended to timely hospital consultation, improve the examination, a clear diagnosis, follow the doctor’s instructions for standardized treatment.