Exostosis is a common symptom of pediatric cerebral palsy and refers to an abnormality in the shape or structure of the foot. In normal individuals, the shape of the foot is maintained by relatively symmetrical extrinsic and intrinsic muscles that maintain its balance. Some congenital or disease suspected causes may also cause foot deformities. Foot entropion is a common symptom of pediatric cerebral palsy, which refers to abnormalities in the shape or structure of the foot. In a normal person, the shape of the foot is maintained by relatively symmetrical extrinsic and intrinsic muscles that maintain its balance. Some congenital or disease suspected causes may also cause foot deformities. The result is that these tendons and ligaments pull the posterior medial aspect of the foot downward, causing the foot to twist inward and the bones of the foot to be in an abnormal position, with the foot turning inward, stiffening, and failing to return to its The bones of the foot are thus in an abnormal position, the foot is turned inward, stiff and cannot return to its normal position. Clinical manifestations 1. Unilateral or bilateral foot deformities of varying degrees appear after birth, with the foot in a plantar flexion position of the ankle joint, inversion and inversion deformity. 2. 2. When the child learns to walk, he walks on the forefoot or the lateral edge of the foot, and as he grows older, the deformity gradually worsens, and in severe cases, he walks on the back of the foot, and bursa and callus appear at the weight-bearing area. 3.X-ray film, front and side view of the affected foot: after birth, the ossification center of the talus, heel bone and dice bone can be seen on the X-ray film, and sometimes the third cuneiform bone can be seen, all the metatarsals and phalanges have appeared, while the tarsal navicular bone does not appear until 3 years old. 4. Estimation of deformity according to three lines: 1) measuring the heel-distance angle on the orthopantomograph, if it is less than 30°, it indicates that there is no inversion of the foot; 2) measuring the angle crossed by the longitudinal axis of the first metatarsal and the longitudinal axis of the talus, which is normally 0°-20°; 3) measuring the angle formed by the longitudinal axis of the talus and the metatarsal surface of the heel on the lateral X-ray, which is normally 35°-55°. If it is less than 30°, it indicates foot drop. If the heel angle is less than 15° and the angle formed by the intersection of the first metatarsal and the longitudinal axis of the talus is greater than 15°, it indicates a subluxation of the talonavicular joint (Simon’s 15° law) Treatment Manual correction method, used in conjunction with orthoses. In severe cases, surgical intervention is required.