Definition
The ischial bone is essentially another name for the ischium. It's the lower and posterior (rear) part of the hip bone. Its main job is to support weight when you're sitting. Think of it as the part that connects your upper body to the chair. Unlike the ilium (the 'wings' of your hip), the ischial bone is smaller and more directly involved in weight-bearing. It contributes to the formation of the acetabulum, where the femur connects.