The tendon pain on the side of the knee can be treated in the following ways: First, if the pain is caused by local muscle or tendon sprain, external fixation with braces and cold compresses can be used to treat the pain, while oral celecoxib, loxoprofen sodium, Hu Lixan capsules, and Pan Long Qi tablets can be taken to reduce inflammation and relieve pain. Secondly, if the local tendon pain is caused by ligament tear, ultrasound and MRI examination is needed to confirm the diagnosis and then consider surgery. Patients who undergo surgery to repair the ligament and restore the integrity of the ligament can completely relieve the symptoms of tendon pain. Patients need to work with rehabilitation after surgery to restore the range of motion and flexibility of the knee joint and to avoid stiffness in the knee joint. Therefore, the tendon pain on the side of the knee needs to be treated according to the different degrees of severity in order to protect the function of the knee joint and to avoid joint dysfunction, which can cause inconvenience in life and work.