Our normal hip joint is a spherical joint, for example, like a bearing, the femoral head and acetabulum should have the same center of the circle. In patients with congenital hip dislocation, the acetabulum develops in the shape of a slope, or a “3”, i.e., the true socket and the socket form a 3-shape; the femoral head is often “pear-shaped” or “snakehead” shaped; The proximal end of the femur should be shaped like a golf club, but in children, it is often shaped like a “straight stick” or even a “serpentine spear” (an illusion of the femoral head becoming more anteriorly tilted). Surgical treatment is to correct these deformities by surgically centering the femoral head, reshaping it in this position and biomechanically promoting the development of the acetabulum and femoral head. Of course, complications such as re-dislocation and joint dysfunction may occur during the reshaping process.