ABSTRACT
The pelvis is the osseous structure that transfers the weight of the upper axial skeletal
structures to the lower extremity via the hip joint. The pelvic ring is comprised of the
sacrum and three bones on each side that coalesce during adolescence to form the ino-
minate bone of the adult pelvis. The sacrum connects to the ilium via an irregular joint,
the iliosacral joint, which is technically an apophyseal joint. The ilium becomes the
pubis anteriorly and the ischium inferiorly. Anteriorly, the two pubic bones connect to
one another via the symphysis and thus close the ring.
