Interosseous sacroiliac ligament- lies deep to posterior SI ligament and runs between the tuberosities of the sacrum and ilium The lower portion (long posterior sacroiliac ligament) - from 3rd transverse tubercle of the sacrum to the posterior superior iliac spine (PSIS).The upper portion (short posterior sacroiliac ligament) - from 1st and 2nd transverse tubercles of the sacrum to the tuberosity of ilium.Ventral/Anterior sacroiliac ligament- from antero-lateral aspect of the sacrum to auricular surface of the ilium Sacrospinous ligament - from the ischial spine to lateral margins of the sacrum.Sacrotuberous Ligament- from sacrum to tuberosity of the ischium.Iliolumbar ligament - from the tip of the transverse process of L5 to posterior aspect of the inner lip of iliac crest strengthens the lumbo-sacral joint.Platypelloid, shallow pelvic cavity, and decreased antero-posterior diameter, broad outlet, during labor there will be difficult for the baby to enter the pelvis at the beginning.įemale Pelvic CavityLigaments and Pelvic Fascia During delivery, she needs to take an active role.Īnthropoid pelvis, oval brim, slightly narrower pelvic cavity than above with larger outlet diameter.
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Gynecoid/ genuine pelvis, the brim is round, more wider, and both ischial spines are less prominent this allows easy baby delivery.Īndroid pelvis, like a heart-shaped brim with narrow pelvic cavity than presented in gynecoid one, get narrower at the supra-pubic arch, and both ischial spines are prominent. In women, the pelvis houses the uterus, tubes, ovaries and vagina.The shape of the female bony pelvis can be classified into four broad categories: gynecoid, anthropoid, android, and platypelloid.The female true pelvis differs from the male in being shallower, having straighter sides, a wider angle between the pubic rami at the symphysis, and a proportionately larger pelvic outlet.The enclosed space between the inlet and outlet is called the true pelvis, with the plane of the inlet being at right angles to the plane of the outlet.The outlet is formed by the pubic arch, ischial spines, sacrotuberous ligaments, and the coccyx.The inlet to the pelvic canal is at the level of the sacral promontory and superior aspect of the pubic bones.