Sorry in advance for the wall of text but you and I have lots of overlap so I wanted to go into detail.
I am a lot like you, active, young 30's, (I'm male), bilateral cam impingement with labral tears causing hip pain, and what would later be discovered after surgery, 15 years of low back and surprisingly enough, 15-20 years of unexplained shallow medial knee pain. X rays showed very slightly''reduced'' hip cartilage spacing (not significant) and very minor and insignificant dysplasia that I was not even told about. No obvious or even suggestive cause of pain seen on any post surgical x ray. I could not walk more than a few minutes without later needing 50-100 mg tramadol just to take the edge of pain off. Nsaids/tylenol would not touch the pain, it was disabling.
I had failed bilateral open surgery to correct the FAI/labral tears, and then failed arthroscopic surgery to again attempt to repair the re-torn labrum, and continued cam impingement. So that's 4 failed surgeries (2 per side) and all imaging ''looking good''. To be more specific I had pain relief for a a few months post op each time, but the pain then fully returned.
At 35 with 4 failed surgeries and losing my ability to walk I was told by 2 surgeons I needed a THR but they wanted to wait due to my age. Another surgeon wanted to perform a periacetabular osteotomy - dumbest idea ever, if you hear that phrase, get second and third opinions because that surgery is about as questionable as they get. I wanted to be able to keep surfing and literally found this website just in time.
So I started looking for a surgeon:
One of the best BHR surgeons turned me down due to ''too much cartilage spacing''. He used a posterior type surgical approach, as do most, which I have read can disrupt blood supply to the femoral head and neck. If you have osteoarthritis and reduced cartilage spacing the disease will cause blood flow to begin to alter itself so disrupting that blood supply is not so critical. If you don't have arthritis and have preserved cartilage spacing, I have read (I could be wrong), you need to be careful to preserve that blood supply. In theory, an anterior or anterolateral (aka trans-gluteal) approach will better preserve that blood supply. Since I didn't have arthritis, and thus my femoral neck/head blood supply had not begun to alter, it made sense to choose a surgical approach that is a little more gentle on that blood supply.
Another surgeon, who has done over 3,000 BHR surgeries, uses an anterolateral approach, and has a track record as good as anyone, said I was a good candidate and later performed the surgeries. So if you go this route and get turned down, don't give up.
I could write another wall of text about which implant/hardware to use but I will sum up my opinion by saying stick with a BHR made by Smith and Nephew. In the hands of the best surgeons their total implant survivorship at nearly 20 years is in the upper 90 percentile. Other newer implants/materials just don't yet have the long term track record, and why experiment with near perfection anyway unless you have a metal sensitivity.
So jump forward and now I am bilateral BHR. My hip pain is gone and at 7 months on my right, and 8 weeks on my left I can walk, hike, do yoga, work on my car etc. Still recovering and it has not been near as easy or as fast as most people post on here but I am continuing to get better/stronger/looser even at 7 months. I could probably surf lightly now (the second hip is healing 2-3x faster than the first) but will wait a few more months as I am probably at 50% and still have some surgical/recovery related pain on both hips.
I won't post my surgeons name here as I am not a doctor, have no medical background, don't want to diagnose you in place of a doctor, and don't want to accidentally spread information that I might be wrong about.
However,feel free to private message me and I will pass his info along to you.
Good luck.