Double Naught Spy
Sus Venator
If you hit any bone in the pelvic girdle, the person will take no more than one step and fall over.
I believe the article (several actually) states that if the bone is broken or shattered that the person will no longer be able to proceed.
It is not good enough to just hit the pelvis. As noted, bullets can pass right through the iliac blade, leave a hole, and not actually produce a break, just a puncture. Additionally, the problem is, you can break off sections of the iliac blade without compromising the girdle integrity. In other words, the ring formed by each innominate that meet at the pubis bones in front and on each side of the sacrum in back can remain intact.
Think of it this way, you can shoot a hole through the shoulder blade without collapsing or destroying the pectoral girdle. The person can often still have significant range of motion of the arm, albeit painful, but the girdle is still intact.
For example, here is a person shot in the ilium that broke off part of the ilium without breaking the girdle itself.
http://www.ulg.ac.be/imagemed/Pages COASS01/6-8-CT-illust-4.htm
Here is a tangential shot to the pelvis, hitting/grazing it, but not doing any real damage...
http://www.medscape.com/content/2003/00/44/96/449664/art-ar449664.fig5.jpg
For more description, see http://images.google.com/imgres?img...m=10&um=1&hl=en&rlz=1T4TSHB_enUS253US253&sa=N
Here is a transpelvic shot that didn't appear to do any harm to the pelvis. Right area, no significant contact. http://images.google.com/imgres?img...m=10&um=1&hl=en&rlz=1T4TSHB_enUS253US253&sa=N
Here is a great image of an innominate from Little Bighorn that shows a nice bullet hole in the illiac blade that did not cause a collapse of the girdle. The bullet simply punched a hole through the bone.
http://images.google.com/imgres?img...&svnum=10&um=1&hl=en&rlz=1T4TSHB_enUS253US253