Knee free bodies are treated based on the results of X-rays and MRIs. The treatment of knee free body usually has the following conditions: 1, single knee free body has no symptoms, usually consider eating amino glucose drugs to protect the joint cartilage from further damage; 2, part of the free single body will produce joint jamming, joint extension and flexion will be jammed, usually the situation through the arthroscope to go in and remove the free body; 3, multiple synovial chondrosarcoma, multiple free body in The knee joint needs to be observed to see if it is related to degenerative disease, and young people still need to use arthroscopy to remove the multiple free bodies. In the elderly, if the articular cartilage damage is very serious, a specific analysis is needed. Removing the free cartilage has less impact on the recovery of joint extension and flexion, and knee replacement, i.e., artificial joint replacement, needs to be considered.