yes I do think there is a correlation to hip pain and to back pain. I have a herniated disk at l5 s1 and l4-l5 is buldging... at least it was as of 3 years ago. I still have pain in my back that radiates down my leg. I often have hip pain and pain in my pelvis. I have decided to start back up on my PT exercises to try to stregenthen the core muscles and see if the pain subsides. One thing that PT had me use was an SI belt to help stabilize my SI joint, that helped my back pain and hip pain.