Hi Sherlock,
I had my colon removed over 20 years ago but had been diagnosed with Crohn's a few years ago. I have been having inflammation in my joints and low back pain for years. I recently have been having hip problems also so I went to an orthopedic specialist. I am having pain in my hip and sacrum so the doctor sent me to physical therapy and I now do specific exercises for it. Here is a link explaining it. Something like this might be going on with you too. It might be worth it to go see an Orthopedic Specialist.
http://www.spine-health.com/co...l-about-sacroiliitisThere is also information about all the extraintestinal manifestations (diseases outside the intestines) of Crohn's and Colitis on the CCFA website but I can't find this specific info about the hips, low back and sacrum this right now.