"Running knee" is a kind of syndrome of knee joint ache, including patella osteochondrosis, intercondylar disease, strain of soft tissues around the patella, tendon disease, sacroiliac tibial friction syndrome, etc., caused by running. The main reason for this is that during running, the knee joints are overly stressed, bending time is too long, the position of the joints is not correct, the surface of the joints is rubbed excessively, causing overload of soft tissues, and abnormal stretching.