Knee swelling after lumbar disc herniation surgery may be edema after surgery, patients can be treated by physical therapy, medication and daily care. 1. Physical therapy: if the patient has knee edema after lumbar herniated disc surgery, if it is in the acute stage, it can be relieved by cold compresses, and after the acute stage, it can be treated with physical therapy through microwave, infrared and other methods. 2. Medication: If patients have knee edema after lumbar disc herniation surgery, they can take oral heptaphyllum saponin sodium tablets or intravenous mannitol and other drugs for treatment. If the nerve root edema is caused by the nerve root pulling during the operation, patients can take oral methylcobalamin and other neurotrophic drugs for treatment. 3. Daily care: If patients have knee edema after lumbar disc herniation surgery, they should take bed rest after surgery and cannot go down to the ground without authorization, otherwise it will lead to aggravation of edema. Patients who have knee edema after lumbar disc herniation surgery should be examined and treated in a timely manner, and the specific use of medication should also be carried out under the guidance of the doctor.