Chronic Pain 2 years Post op- Hip Replacement

My husband has had bad hips his whole life. The Doctors speculate his growth plates slipped in early adolescent, causing deformed hips. Fast forward, at 60 he had his right hip replaced. No pain until the 4th week post-op during PT and surgical site infection. He was put on antibiotics for over 15 weeks, surgery site was never washed out. The pain has never gone away! He's had 4 hip aspirations, all of which have shown no infection. After 20 weeks of PT, 3X week, pain never improved. Physical Therapist told him to go back to the surgeon because he was not progressing. The Surgeon recommended iliposoas tendon release surgery. He had iliposoas tendon release surgery, and 8 more weeks of PT, 3X week. The pain never improved. He has tried acupuncture, electroacupuncture, stretch Lab, Cortisone injections. For diagnostics, he's had MRI's of hip, pelvis. and lower back, the results are all normal. He's had a three phase bone scan, which shows no infection or loosening. He has severe startup pain going from the sitting to the standing position, in the groin/socket area. We've seen so many doctors, with no answers. Please help us, any advice?