Lower leg injuries? You may need a stronger pelvic region

I'd been having a lot of different lower leg issues and went to see a PT. He did some testing of the strengh in my pelvic region and it was poor. He gave me a few exercises to help with issue and my running is now feeling much more controlled stable and the injuries are staying at bay. I found this blogspot www.inmotion2.blogspot.com that you all may find helpful and informative in your quest to get over nagging injuries. Its written by two PT's.  I also had a leg length discrepency which had to be addressed with orthotics but thats something that also contributed to my asymetrical weaknesses.