At present, we would like to briefly explain several questions that parents often ask by phone. 1. How to take care of the patient during the postoperative period when there is a cast fixation? After surgery, we need to turn more often to prevent pressure from the cast and to avoid decubitus ulcers on the hip. Because of the strong cast fixation, general handling and turning will not cause dislocation of the joint, which means it will not affect the surgery. In addition, water or urine should be avoided to soak into the cast, otherwise it will cause skin erosion and ulceration. 2. How to observe the incision while wearing the cast? You can reach into your hand to feel whether the dressing is dry and whether there is any ooze; pay attention to whether the steel needle inside the body is abrading the skin. Whether the incision is infected or not, the child’s body temperature is also an important reference indicator. 3. When do I come to the hospital for review after surgery? Generally, you should come to the hospital for a follow-up examination 8 weeks (2 months) after surgery, that is, 1 week earlier or 1 week later. 4.How to take pictures during the review? When the cast is removed after surgery, films are routinely taken to see how the osteotomy is healing. In order to save time, if you can ensure that the film is clear, you can also take it in advance locally. Otherwise, come as early as possible on Tuesday morning or Monday afternoon. 5.How do I exercise after the cast is removed? After the cast is removed, the affected limb should not bear weight for 2 months, that is, it should not walk on the ground. During this period, you should lie in bed more often for functional exercises, mainly to exercise the hip flexion and extension function, which is very important and directly affects the child’s future gait. In addition, you can also separate your legs and hold your child as much as possible to keep him in frog position. 6.When should the femoral plate be removed? Generally, the femoral plate should be removed 6 months to 1 year after surgery, not more than 1 year, otherwise it will be difficult to remove.