After patella fracture, knee tightness may be caused by knee joint adhesion, after patella fracture, no matter conservative treatment or surgical treatment, the knee joint has to be fixed for a period of time, fixed for a period of time will lead to adhesion of soft tissues inside the knee joint, which will lead to stiffness of the knee joint. Functional rehabilitation is needed, and if the rehabilitation is not done well, the adhesion will become more and more serious, and eventually lead to the knee being tight and difficult to flex. Rehabilitation generally within two months can be fully recovered, that is, the adhesion is not more than two months can be fully recovered through functional rehabilitation, between two and three months the rehabilitation effect is not very good, there may be a part of the legacy is that the flexion can not reach the normal level, after more than three months only through the functional exercise, the stiffness of the knee joint does not get any relief.