Which is not part of the hip bone?

The hip bone is comprised of three parts; the ilium, pubis and ischium. Prior to puberty, the triradiate cartilage separates these parts – and fusion only begins at the age of 15-17.

Together, the ilium, pubis and ischium form a cup-shaped socket known as the acetabulum (literal meaning in Latin is ‘vinegar cup‘). The head of the femur articulates with the acetabulum to form the hip joint.

The ilium is the widest and largest of the three parts of the hip bone, and is located superiorly.

The pubis is the most anterior part of the hip bone.

The ischium forms the posteroinferior part of the hip bone.

Sacrum is a part of the vertebral column.