THE PELVIC GIRDLE
The pelvic girdle is formed from two innominate (hip) bones.
The pelvis is the term given to the BASIN-SHAPED structure
formed by the pelvic girdle and its associated sacrum.
INNOMINATE (HIP) BONES
Each hip bone consists of three fused bones: the ilium, ischium and pubis.
On its lateral surface is a deep depression, the acetabulum,
which forms the hip joint with the almost-spherical head of femur.
The ilium is the upper flattened part of the bone and it
presents the iliac crest, the anterior curve of which is called the anterior superior iliac spine.
The ilium forms a synovial joint with the sacrum, the
sacroiliac joint, a strong joint capable of absorbing the stresses of weight
bearing and which tends to become fibrosed in later life.
The pubis is the anterior part of the bone and it
articulates with the pubis of the other hip bone at a cartilaginous joint, the symphysis pubis.
The ischium is the inferior and posterior part. The rough
inferior projections of the Ischia, the ischial tuberosities, bear the weight
of the body when seated.
The union of the three parts takes place in the acetabulum.
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