http://pklpt.com/diagnosing-your-pain/

So here is my understanding of how this could happen. C7 nerve root innervates Latissimus Dorsi. Lattissimus dorsi has attachements in the arm and pelvis. It is in same area as Thoracolumbar vertebrae. So C7 nerve root compression can irritate the lats causing the thoraco/lumbar vertebra to "Lock up" and compress those nerve roots some of which innervate pelvic organs.

It is a case of "all dem rattlin bones"