A couple of thoughts. I had a terrible bout of prostatitus a couple of years ago due to the horn of diamond frame bicycle saddles. This caused a lot of pain in the hips area. However you mention your hip joint may be involved. Since my mid 30's my right hip has not been good. The only way I keep it from hurting bad is by taking Glucosamine Chondroitin. I buy mine over the counter at Walgrens. I take one pill a day and I don't have pain. Don't take the pill for a couple of weeks and I can't walk. Hopefully your doctor will find a solution to your pain. I've always kept a recumbent for those times of injury that made diamond frame riding uncomfortable. I also like the recumbent for longer rides. They are just much more comfortable. Good luck with your search for pain free bicycle riding.