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The pelvic girdle is a ring-like structure, located in the lower part of the trunk. It connects the axial skeleton to the lower limbs. In this article, we shall look at the structures of the pelvis, its functions, and the applied anatomy. Structure of the Pelvic Girdle. The bony pelvis consists of the two hip bones (also known as innominate or pelvic bones), sacrum and coccyx. There are four articulations within the pelvis: Sacroiliac Joints (x2) â Between the ilium of the hip bones, and the sacrum. Sacrococcygeal symphysis â Between the sacrum and the coccyx.
234 238) The pelvic girdle is formed by the paired os coxae (coxal bones). Together with the sacrum and coccyx of the axial skeleton, this group of bones forms the bony pelvis. The ability to bear weight is more important in the pelvic girdle than the pectoral girdle.Thus, the os coxae are heavy and massive with a firm attachment to the axial skeleton. Each os coxa is a result of the fusion of three bones: the ilium, ischium, and pubis.These three bones fuse at the deep hemispherical socket, the acetabulum, which receives the femur.Figure 8: Right os coxa, lateral and medial views A. Ilium: Large, flaring bone; forms superior region of os coxa.he ability to bear weight is more important in the pelvic girdle than the pectoral girdle. Thus, the os coxae are heavy and massive with a firm attachment to the axial skeleton. Each os coxa is a result of the fusion of three bones: the ilium, ischium, and pubis.