The flattening of the posterior horn of the lateral meniscus may be due to the strain caused with age and long-term weight bearing, which can be relieved by general treatment, medication and surgery. 1. General treatment: Proper rest should be paid attention to and strenuous exercise of the knee joint should be reduced. Hot towels or hot water bags can be used for localized warm compresses. Must pay attention to the maintenance of the knee joint, as far as possible to avoid squatting and up and down the stairs, climbing and other knee flexion and rotation of the action, more quadriceps muscle strength functional exercise. 2. Medication: Oral non-steroidal anti-inflammatory drugs such as nimesulide, diclofenac sodium, ibuprofen, etc., can effectively reduce inflammation and pain, relieve local inflammation and reduce the discomfort of patients. Oral glucosamine sulfate can also be taken to promote the recovery of cartilage in the joints. 3. Surgery: If the degeneration of the knee joint is serious, the meniscus becomes unstable due to tearing, the joint space narrows significantly, and the joint is swollen, deformed, and the activities are limited, then surgery can be considered. It is recommended to use medication under the guidance of a doctor, not blindly self-medication to avoid adverse effects.