Pain after knee replacement can be relieved by oral medication, and can also be improved by strengthening exercise to promote functional recovery. Knee replacement will cause obvious pain after the operation due to the damage caused by the operation on soft tissues and bony structures, which can be relieved by oral anti-inflammatory and analgesic drugs, such as diclofenac sodium and celecoxib. Most of the knee joints of patients with knee replacement surgery have deformities such as inability to fully straighten and inversion and eversion, and the knee joints will be unable to fully straighten and flex after the surgery. At this time in the functional exercise, will also cause obvious pain. You can take anti-inflammatory and analgesic drugs to strengthen the functional exercise, and the pain will be reduced naturally after the recovery of knee joint function. If there are symptoms of pain after knee replacement, it is recommended that the patient go to the hospital for medical examination, improve the examination and receive regular treatment.