Classification of knee anteversion Knee anteversion, also known as knee hyperextension, knee anteversion, where the knee joint is angled backward are of this type. According to the causes can be divided into: ① anterior knee paralysis or low muscle strength type: due to quadriceps paralysis or low muscle strength, N rope muscle weakness, the knee can not be stabilized in the straight position, forced to walk in the back position when loaded; ② after the knee paralysis or low muscle strength type: the N rope muscle and calf triceps are paralyzed or low muscle, after the knee, including the joint capsule, ligament and other laxity, caused by the knee hyperextension; ③ the knee joint itself bony changes, to the knee position is not normal. (iii) Bony changes in the knee joint itself, resulting in an abnormal position of the knee joint. The first two types are caused by the loss of proprioception in the knee joint due to poor control. According to the degree of knee hyperextension, it is classified as mild (below 10°), moderate (10-30°) and severe (above 30°). According to the presence or absence of destruction of joint structures it can be categorized into functional knee counterflexion and organic knee counterflexion. It is a more severe deformity and its treatment is relatively slow and time-consuming. At present, the application of exercise therapy for children with knee reflexion to carry out functional training to achieve more satisfactory results: 1, knee pressure foot method, ankle pulling method, shaking the ankle method, sacral flexor muscle pulling training. 2, knee flexion and extension, foot dorsiflexion training, improve the strength of the extensor muscles, coordinate the antagonist muscle tension. 3.Crawling training. Knee flexion position, is conducive to the correction of antalgic tension, while increasing the control of knee joint movement and coordinating its motor function. 4.Improve the national rope muscle strength to reduce the extensor muscle tension and coordinate the joint flexion and extension function. 5.Up and down step training. For correcting the knee antitension and coordinating the gait has a greater effect. 6.Improve the strength of quadriceps muscle and the muscle strength of the posterior thigh group. Correction of “knee anteversion”, mainly to control the lower limb extensor muscle movement, generally mild cases to sports training correction. Methods are as follows: the child’s hands and knees kneeling position supported on the mattress, the affected side of the knee to do flexion and extension training, in order to coordinate the movement of the two knees alternately flexion and extension training, with the improvement of the symptoms, into the supine position or standing position, the lower limbs of the severe cases of orthopedic or surgical correction. (For the knee anteversion phenomenon should analyze the causes, roughly quadriceps muscle weakness, quadriceps muscle spasm, gastrocnemius muscle spasm and so on several reasons) 1, extensor muscle strength and flexor muscle strength serious imbalance, that is, the flexor muscle strength is too small. 2. Excessive tension in the extensor knee muscles. 3, Extensor muscle weakness. 4, Excessive tension in the calf triceps/i.e. foot drop, passive inability to cross the neutral position. 5, May be related to hip control. 6.Weakness of the quadriceps muscle is also a cause of knee hyperextension. 7, Weakness of one knee leads to contralateral compensatory knee hyperextension. 8, Flexor spasm or contracture leads to knee hyperextension. 9, Knee hyperextension is used to compensate for knee collapse gait. 10, Spasm of the support phase extensor knee muscle. 11, The line of gravity falls in front of the knee center when the trunk is bent forward, prompting the knee to extend backward to maintain balance. 12, Compensatory knee hyperextension due to Achilles tendon contracture.