The hip bone is made up of the ilium, sciatica and pubic bone.
The hip bone is a relatively large irregular bone that consists of three parts: the ilium, the sciatic and the pubic bone. At birth, the ilium, sciatica, and pubis are separated by hyaline cartilage, and by the end of puberty, the three parts fuse together to form the hip bone.
The ilium is the uppermost region of the hip bone and is relatively large making up two-fifths of the overall hip bone. The sciatic bone, which is primarily the lower and posterior part of the hip bone, sits below the ilium and behind the pubic bone, and the sciatic bone is the strongest of the three components. The pubic bone is the third component and primarily forms the side and front of the hip bone.
The hip bone is a relatively stable structure and generally should not be damaged, but if it is subjected to stronger elements of violence, it can be fractured, at which time the pain will also be more intense and require prompt medical attention for treatment.