The ventral inner margin of the preacetabular portion of the ilium is attached to the pre-sacral vertebrae, whilst the inner and dorsal margin of the postacetabular portion is attached to the primary sacral and the postsacral vertebrae.
In rare cases the right and left preacetabular blades fuse with each other above the spinous processes.
The preacetabular portion of the ilium is shorter than the posterior half.
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