I wanted to chime in here and suggest that an MRI might be a good idea since I see Prednisone on your signature. It would rule out any mechanical problems with your bones. The pain you're describing is similar to what the folks on the AVN/ON (avascular necrosis/osteonecrosis) board describe. My daughter has it, but was diagnosed early in stage 1 and 2...I'm certainly no doctor nor am I saying that this is what's going on, but it does deserve some more indepth evaluation and an MRI would at least put your mind at rest that it's not AVN/ON. All the best, and I hope you get some relief soon!
20 yo daughter w/ Pancolitis
Step 1 colectomy/jpouch creation 11/27/06
Step 2 takedown 2/9/07
VSL #3 DS
21 yo Daughter diagnosed with right shoulder, bilateral wrist,
bilateral elbow, bilateral knee, and bilateral ankle avascular necrosis
(aka Osteonecrosis) as a result of Prednisone use