Cerebral palsy is a non-progressive brain injury caused by various causes from before birth to within 1 month after birth, mainly manifesting as central motor deficits and postural abnormalities, often accompanied by mental retardation, language disorders, epilepsy and other complicating disorders. The causes include: prenatal congenital malformations of fetal brain tissue, viral infections, chemical and radioactive damage, alcoholism, drug addiction, etc.; perinatal preterm birth, cord winding, placental abruption, intrauterine hypoxia, etc.; postnatal infant infections, trauma, etc. Fifty-one percent of injuries occur in the prenatal or perinatal period, and only 16% occur in the postnatal period. Due to improved medical technology, many low birth weight infants have survived, but the incidence of cerebral palsy has increased. Cerebral palsy is diagnosed in infants born 3 months prematurely who are still unable to walk by month 15. The goal of treatment for cerebral palsy is to improve function, including: speech, reading and writing, daily living skills (e.g., eating, dressing, etc.); and walking skills (e.g., independent walking, use of walkers, etc.), in order to reduce the burden on the family and society. Treatment methods: include systematic physical therapy; occupational therapy; medications, such as botulinum toxin, intrathecal baclofen injections, phenol, Valium, etc.; various types of braces and walkers; and surgery. Physiotherapy is usually the treatment of choice, but there is no scientific basis to confirm its efficacy. The significance of surgical treatment is to improve the functional status of the child and to create conditions for rehabilitation, as well as to prevent the appearance and progression of deformities. The strategy of lower limb surgery for cerebral palsy is to correct all deformities at once, restore the line of gravity of the lower limbs to facilitate standing and walking and functional recovery, and reduce surgical pain and more psychological trauma. The best age for surgery is when the child can walk and can establish a mature gait, when the child can cooperate well with the rehabilitation training, which is conducive to a better recovery. The development of spastic cerebral palsy in adolescence is often accompanied by obvious limb deformities, among which lower limb deformities are common, such as hip adduction deformity, knee flexion and foot drop inversion. In infancy, these deformities are mostly dynamic and muscle contractures are rare. In adolescence, fixed muscle contractures can occur, leading to deformities such as knee flexion and foot drop inversion. Generally speaking, surgery is not recommended for deformities before the age of 3 years to avoid overkill. The best time for soft tissue surgery is when the child has developed to a stable gait, usually up to 5 years of age, and the surgical approach may change as the developmental status varies. Early treatment of pediatric spastic cerebral palsy is usually done with selective posterior spinal nerve rhizotomy and antispasticity medications, while development of fixed deformities in adolescents often requires orthopedic surgical intervention. Since the deformity is relatively fixed after adolescent cerebral palsy approaches or completely stops development, it is mostly able to better cooperate with postoperative functional exercises. Orthopedic surgery for cerebral palsy is a treatment system with the following basic principles: improvement of pathological muscle spasm, correction of limb deformity, equalization of muscle strength, stabilization of joints, and reconstruction of static and dynamic balance of the lower limbs. This is the basis for the correct surgical plan. The criteria for the correct surgical plan are: the effect of improving spasticity and correcting deformity; the absence of recent or long-term complications; the basic solution of polyarticular deformity of the lower extremity in one stage of surgery as far as possible, which will facilitate the recovery of function and the rehabilitation of the body; and for those who need to perform two surgeries, the effect of the first and second surgeries will not affect each other. Orthopaedic strategy and choice of surgical method: Overall consideration, individualized design, different nature of surgery can be combined. In this way, both the deformity can be corrected and the cause of the muscle spasm that caused the deformity can be removed. For example, tendon surgery, neuromuscular branch severance of spastic muscle groups and orthopedic surgery for bony deformities should be performed simultaneously. The first stage of surgery restores the gravity line of single or double lower limbs to create conditions for patients to stand. For example, the release of hip adduction deformity, flexed knee, clubfoot or horseshoe foot deformity can be solved in one surgery. Since more than 2 joint parts are to be performed in 1 time on one or both legs, generally more than 4 or even 10 surgical approaches, reasonable arrangements should be made for the steps of surgery during surgery. Post-operative functional rehabilitation training: The main goal of functional training is to enhance the strength of non-spastic muscles, improve balance function, avoid or reduce joint contracture, and improve motor function. The human nerves, skeletal muscles and their connected bones and joints follow exactly the principle of using in and out in order to adapt to the changes needed, and for patients with cerebral palsy, the importance of functional training should be emphasized. Correct and effective functional training in the early postoperative period can fully mobilize the patient’s subjective initiative. The motor and life potential of the patient can be tapped. The general requirement is that those whose knee and ankle joints have been braked (long-leg cast), especially those who have done tendon transposition, should be encouraged to do leg lifting exercises, muscle isometric contraction exercises within the cast, i.e. static muscle training and joint activities at the end of the limb on the third postoperative day. Due to the contraction of the affected limb muscles, it can promote the venous and lymphatic return of the limb, reduce the adhesions between muscles and eliminate swelling; it can also slow down the muscle atrophy and give physiological pressure to the osteotomy to facilitate its healing. With the development and application of new fixation materials and orthopedic devices, the method of limited motion has been gradually adopted after knee, ankle and foot joint surgery, i.e., the joint can intermittently do limited motion during the braking period, i.e., dynamic muscle training, and the angle of braking can also be adjusted. Generally, one week after surgery, you can get out of bed and walk in a cast shoe with a walker. Some patients should wear an orthotic for a period of time after removal of the cast. The purpose of orthotics and assistive device treatment for cerebral palsy is to prevent deformity and correct deformity.