Surgical treatment is recommended for many knee free bodies, while conservative treatment with medication can be chosen if the free bodies are small. After the discovery of free bodies, if they are larger and more numerous, timely knee arthroscopy is recommended to remove the free bodies and repair the damaged cartilage. If left untreated, the free bodies may cause further deterioration of the articular cartilage. In most cases, surgery can result in dramatic improvements in knee pain and mobility. If the knee free body is accompanied by severe osteoarthritis, an artificial joint replacement is required. If the free body is small and there are no obvious symptoms of knee impingement, conservative treatments such as oral non-steroidal anti-inflammatory drugs (NSAIDs) or applying medications that invigorate blood circulation and reduce blood stasis can be used to reduce pain. At the same time take aminoglucosan drugs to protect the joint cartilage. It is recommended that the patient go to the hospital in time to clarify the size and number of free bodies, and choose the treatment under the guidance of the doctor.