1.What is hip dislocation? Hip dislocation, which used to be called “congenital hip dislocation” in medicine, is the most common pediatric hip disorder, with the incidence of girls being 6-8 times higher than that of boys. Now, the name “developmental hip dysplasia” is more commonly used. Because “developmental hip dysplasia” includes complete dislocation of the hip joint, subluxation and acetabular dysplasia, the so-called “developmental” means that the disease is not always congenital, but can also occur after birth. 2.What are the dangers of hip dislocation? If the disease is left untreated or improperly treated, it can cause limping, hip pain, limited function, etc. 3. What are the risk factors for hip dislocation? Girls, first child, low amniotic fluid, breech delivery, having the same patient in the family, having other congenital anomalies. Improper swaddling, e.g., tying the child’s lower limbs too tightly after birth is likely to cause hip dysplasia, which can lead to hip dislocation in severe cases! How to detect hip dysplasia at an early stage? (1) Children who can’t walk: the baby lies down and spreads her hips towards both sides (knees at right angles, thighs perpendicular to the body). If the baby’s legs are stiff and cannot be spread; if the stripes of the baby’s two thighs are asymmetrical and the legs have lengths, it is also often a pediatric hip dislocation. The hip on the affected side has less movement and is restricted in its movement. The pedal force is weaker than the healthy side. It is often in a flexed position and cannot be straightened. (2) Children who can walk: one side of the hip dislocation has limp, unequal length of the lower limbs; bilateral walking body swaying back and forth, manifested as “duck step” gait. 5.How to diagnose hip dislocation? (1) Physical examination by experienced doctors. (2) X-rays: cannot confirm the diagnosis for small babies. (3) MRI, ultrasound: it can be diagnosed in newborns without radiation damage. 6. How to treat hip dislocation? Basic principles of treatment: (1) Within half a year old: sling, brace. (2) Half a year old～1.5 years old: brace, plaster. (3) 1 year and a half to 2 years old: conservative treatment or surgical treatment. (4) More than 2 years old: surgical treatment. 7, hip dislocation is not terrible, prevention and early correct diagnosis and treatment is the key: (1) change the bad swaddling way! Not tying the legs will not produce the “rotund leg”, while tying the legs may cause hip dislocation. (2) Increase awareness of the risk factors for hip dislocation in your child! Early diagnosis and treatment can be achieved. (3) The earlier the treatment, the cheaper and more effective it is! For example, if the treatment is started in the newborn period, the child can be completely restored to normal without sequelae. On the contrary, the later the child is found, the older the child is, the more difficult it is to treat, the more money it costs and the more pain it causes!