The term 'Upper Pelvic Bones' refers to the two bones that make up the pelvis, the ilium and the ischium. The ilium is the uppermost of the two bones and is often referred to as the 'hip bone'. It is a large, flat bone located at the top of the pelvis and is connected to the sacrum and the spine. The ischium is the lowermost of the two bones and is located at the bottom of the pelvis. It is a curved bone that forms the posterior part of the hip joint. Together, the ilium and the ischium form the upper pelvic bones.