ABSTRACT

Pelvis and Sacrum Anatomy an d Function • The anatom y o f the pelvis consists o f the right and left innom inate bones, the sacrum,

and the coccyx. • The innom inate bone consists o f the ischium, pubis, and ilium. • The sacrum lies between the two innom inate bones form ing the SI joints posteri­

orly. The innom inate bones join together anteriorly at the symphysis pubis. • The acetabulum is a deep, cup-shaped indentation in the lateral aspect o f the in­

nom inate bone. It is made up o f the ilium superiorly, the ischium inferolaterally and the pubis anterosuperiorly.