Aseptic necrosis of the femoral head in children, also known as LeggPerthese disease, is a self-limiting disease, the cause of which is not known, with a predilection for the age of 8 `10. Although ischemic necrosis of the femoral head in children is a self-limiting disease, if we do not actively intervene surgically, the outcome is often very poor because the femoral head is severely deformed and becomes “square-headed deformity” or “hump-shaped double-headed deformity”, which seriously affects the function of the hip joint and leads to pain and claudication. This can cause pain and claudication. The latest research shows that once ischemic necrosis of the femoral head develops, the cartilage proliferation is very active and becomes disorderly, growing only in the direction of no pressure, i.e., to the outside, resulting in a flattening and widening of the femoral head and a square-headed or double-headed deformity. After ischemic necrosis of the femoral head, conservative treatment can be used, and the affected hip joint can be abducted at least 45° to turn the lateral epiphysis of the femoral head into the acetabulum, but this method is very unrealistic, because the course of ischemic necrosis of the femoral head is 2~3 years, and no one can guarantee the continuous abduction of the hip joint for such a long time. Therefore, only surgery can solve this problem with a similar principle. The principle of surgery, we always give the analogy of growing watermelons, which are usually round or oval, but growing a square watermelon has been very easy to achieve by controlling it with a square container at the seedling stage, and eventually it grows into a square. The most commonly used procedure, the Staheli acetabularplasty, was pioneered by Professor Lynn Staheli, former director of Seattle Children’s Hospital and a renowned pediatric orthopedic specialist in the United States, who first published an article on the treatment effects of the procedure in 1981. The procedure was originally designed for acetabular dysplasia and was later extended to treat ischemic necrosis of the femoral head in children with good results. This approach is designed to limit the lateral growth of the femoral head by increasing the lateral coverage of the acetabulum, and to shape the acetabulum within a more than semicircular shape. Other surgical approaches include proximal femoral inversion osteotomy (which also permanently transfers the lateral femoral epiphysis into the acetabulum), Salter’s pelvic osteotomy (which covers the lateral femoral epiphysis through a pelvic rotational osteotomy), and single-arm external fixation frame hip distraction (which allows the femoral head to hang within the hip joint by pulling the hip joint to see that it is free of pressure in any direction), all of which can be used to limit the development of the femoral head deformity and to shape the femoral head. The last method is widely used in Israel. This last surgical method has been widely expanded in Israel.