Some of the causes of second degree meniscus injury are degenerative meniscus disease and external force on the meniscus. Meniscus second-degree injury refers to meniscus injury, but the scope of uninjured did not reach the joint surface, there is no meniscus breakage. 1. Degenerative meniscus lesion: due to the growing age, large activities, etc., the patient’s meniscus wear and tear, dysfunction, resulting in the patient’s meniscus second-degree injury. 2. Meniscus by external forces: due to playing basketball or soccer incorrect posture caused by knee sprains, pain, edema, etc., triggering patients with meniscus wear and tear, the meniscus of the second degree of injury. If the patient has a second degree meniscus injury, it is recommended that the patient go to the hospital in time. Improve the knee CT, color ultrasound, MRI and other tests to clarify the cause of the disease, and follow the doctor’s instructions for treatment.