I'm so sorry.
I didn't realize he was still in pain.
I'm about done with what I have to do... so PM if you want to.
Did you find a good symptoms list?
If you really suspect this, then he should not be allowed to run, jump, play, etc. He needs to stay very still until you get him in for an xray. He will have to be treated like glass until it is ruled out. I'm sure some general DVMs do the xrays, but I'd have to be convinced that they know what they are doing and have done it before... It may be best to find a specialty hospital in the area. Hopefully they can rule AAI out and then find the problem.