Correcting knee hyperextension does not make the patient taller, and some patients assume that knee hyperextension will cause them to grow in height if they can turn their backward angulation into a straight line. In fact, this is not the case. The so-called hyperextension of the knee joint actually means that when the patient straightens the knee joint, the tibia bone as a whole is excessively translated backward, which may cause a certain angle to appear at the back of the knee joint. This can be corrected with surgery or functional exercises to strengthen the muscles on the back side of the knee as well as the posterior cruciate ligament. However, the principle of correction is to make the lower tibia as a whole translate to the front, and there is a certain degree of rotation, and not to make a corresponding change in its angle, so the length of the whole lower limb is not changed, and will not make the patient taller.