Posterior hip dislocation usually has a clear history of trauma, and the hip is painful and uncomfortable after the trauma. The typical deformity is that the affected limb is in flexion, inversion, internal rotation, and shortening deformity. The type of hip dislocation and the presence of a combined acetabular fracture can be determined by x-ray examination. For posterior dislocation of the hip joint, closed repositioning under general anesthesia is required. After resetting, the affected limb should be appropriately traction-braked, and CT and 3D reconstruction of the pelvis should be further improved to determine whether there is a combined acetabular fracture. For simple posterior hip dislocation, it can be cured after reset, but if there is an acetabular fracture, surgery is needed if necessary.