I am not sure if the Orthodog group on Yahoo still is active, but that' a good place to check into for information.
Me, I'm a big fan of the FHO as a procedure on a dog with bad hips. A lot of times an ortho surgeon won't recommend it - unless you are in some places, where they flip what you will hear here - places like Perdue will say that the FHO is the gold standard, THR is salvage.
I like it for a lot of reasons but especially the recovery period is so much easier on everyone.
Bonus - FHO should be considerably cheaper than a THR.
Board certified ortho vets are always nice to have. The vet who did my dog's hip is not, but does ortho surgeries - hips, knees - all the time so is used to doing them. The number and quality are important. Do they do enough that they know what to do if something is weird in there, do they know what recovery is supposed to look like, then how do they do on infection control (less of a worry for FHO but still there for bone surgery), and will they let you talk to someone who has had one for their dog (I've done that for my vet before), among other things.
I think I read your vet is getting tired of you and I would find a new vet that doesn't mind a pet owner wanting to work in partnership with them. My vet office practically has those exact words in their mission statement hanging in the lobby. Start talking to people - lots of people because what makes one happy with their vet would send someone else into fits, google, talk to groomers, trainers, rescue people, and then ask if you can talk to someone at the vet offices you come up with.
has a way to look for a board certified surgeon.
Having said that I have no idea about that hip xray, and would want to make sure his elbows, shoulder and spine looked okay before moving forward so that I knew what I was going to be impacting in other places. Plus his age, general health, blood work would all play a part in planning. Good luck!