There are three bones of the hip: ilium, ischium and pubis, which come together to form a cavity called the ____________, for the attachment of the femur.
Acetabulum
There are three bones of the coxa (hip bone) that come together to form the acetabulum. Contributing a little more than two-fifths of the structure is the ischium, which provides lower and side boundaries to the acetabulum. The ilium forms the upper boundary, providing a little less than two-fifths of the structure of the acetabulum. The rest is formed by the pubis, near the midline.