Not a vet, but have had my vets go over some xrays with me. I would think if she was dysplastic, you'd be seeing some physical signs of it on the xray. Maybe fair-to-good? Did the vet go over the xrays with you? Was it the orthopod?
The vet did not. He did show me the x-ray and then mentioned about her age and her x-rays looking fine. The Ortho didn't really go over the x-ray with me either. He did manipulate her hips a bit but then started talking surgery. He talked about doing a TPO
(Triple Pelvic Osteotomy) surgery. He also wanted to sedate her to feel the laxity in her hips. Since surgery is out I really didn't want to put her through that again as last time it seemed that popping her hips out several times while sedated didn't feel the best for her. So I opted out of having that done. He mentioned keeping her active and watch for signs of pain. That was about it.
two, that a dog under sedation is incredibly relaxed and often you can get some joint laxity in a dog who is simply very flexible even if there isn't HD present.
I've always thought her to be quite flexible, ha. I wonder if you could get a false positive result for something like that in the palpation/Ortolani test since she was sedated? Hmm probably not, but interesting to think about.
The other way hips can look good is whether there is degenerative joint disease (DJD) or arthritic changes visible in the hips (the terms are often used interchangeably). That is something that will change over time and I'm guessing that's what your vet was talking about because there is no hint of it in your dog's x-rays.
Ya, I think this is also what he was referring to.