X-ray of right hip dislocation Developmental Dysplasia of the Hip (DDH), also known as Congenital Dislocation of the Hip (CDH), is a disease that has a relatively large impact on children’s development, and is one of the major diseases leading to physical disability in children. The specific cause of the disease has not been elucidated yet. It may be related to unilateral or bilateral hip instability caused by heredity, breech birth, leg binding, etc., which leads to semi-dislocation or complete dislocation of the femoral head and acetabulum. Clinical manifestations 1, newborns and infants: (1) joint activity disorder: the affected limb is often flexed, the activity is poorer than the healthy side, and the pedal force is located on the other side. Hip abduction is limited. (2) Shortening of the affected limb: the femoral head of the affected side is dislocated backward and upward, and the corresponding shortening of the lower limb is common. (3) Changes in skin lines and perineum: asymmetry of skin folds on the buttocks and inner thighs. The skin lines on the affected side are deeper and more numerous than those on the healthy side. The labia majora are asymmetrical and the perineum is widened in female infants. (2) Early childhood manifestations: (1) limp gait: limp is the most common complaint of parents during pediatric visits. When one side is dislocated, it is limp; when both sides are dislocated, it is “duck step”, and the child’s buttocks are obviously protruding backward, and the lumbar anterior convexity is enlarged. (2) Shortening deformity of the affected limb: in addition to shortening, there is at the same time internalization deformity. Auxiliary examination Ultrasound examination: applicable to children aged 0-6 months. Conventional orthopantomogram of the pelvis: applicable to children over 6 months old. CT and MRI: CT can evaluate the bony condition of the femoral head and acetabulum, and clarify the three-dimensional positional relationship between the two; MRI can more comprehensively evaluate the condition of the acetabulum and the alignment of the femoral head and acetabulum. Pavlik sling treatment for hip dislocation in children less than 6 months old Closed reset of hip dislocation + frog cast external fixation in children over 6 months old X-ray review after closed reset of left hip dislocation + frog cast external fixation X-ray review after pelvic osteotomy + rotational osteotomy for shortening of the left femur in a 4 year old child with left hip dislocation X-ray review after surgery 1. Closed reset children: review after 2 weeks of discharge from the hospital, change of the cast after 6 weeks of hospitalization, and then remove the cast to change the external fixation support after 6 weeks of discharge. The cast was removed and replaced with external fixation support. 2, Open restoration children: 2-4 weeks outpatient review, 3 months after the operation to remove the cast, according to the situation of wearing a brace, six months after the operation can walk on the ground. 3. Usually, the follow-up time after surgery is more than 5 years, the wound healing is good, the femoral head and acetabulum can be aligned, the acetabular index is basically normal, and there is no necrosis of the femoral head. The child walks well and reaches the standard of cure. Prognosis Congenital hip dislocation, if left untreated, with the increase in age, the child’s gait abnormality will gradually aggravate, and there will also be hip pain and discomfort, which will have a great impact on life. At present, the international treatment of congenital hip dislocation has formed a set of standard procedures, the prognosis of congenital hip dislocation is good, if the early treatment, the vast majority of children can be fully recovered to normal after treatment, the earlier the age of diagnosis, the better the results. The earlier the age of presentation, the better the outcome. After 18 years of age, the treatment is more complicated and the outcome is poorer than that of younger children. Family members are advised to keep a close eye on their baby’s lower limbs for any abnormalities in movement, and if there are any problems, the child must be taken to a children’s specialty hospital (which must have an independent orthopedic department for children) for treatment. At present, many large general hospitals do not have pediatric orthopedic departments, so generally adult orthopedic surgeons will not treat the disease! Otherwise, if misdiagnosed and mistreated, necrosis of the femoral head can easily develop and the child will definitely be left with serious sequelae, making the child suffer for the rest of his/her life!