FWIW, apparently reading hip x-rays is somewhat of an art form and it also requires that the x-rays be really good shots.
Before I would put my young dog through surgery, I would want those x-rays repeated in a f6 months and I would get them OFA or Penn Hip'd. Then you'll really know where you stand.
I'm not sure what breed your dog is, but I now with some larger breeds, when they go through a period of rapid growth and they have fairly loose joints, things can appear or be much worse than they might be later on. (which is why you can't OFA or Penn hip before age 2 I believe) That's why I would do some conservative therapy for a while and reasses. If it was me I'd do physio and do aquatherapy, make sure the dog is on the very thin end of healthy weight range, try adequan or some other anti-inflammatories if need be and get on some joint supplements like Glyco flex and also some fish body oil and vit E. Arnica (homeopathic) is really helpful if the dog over exerts and ends up sore. It's also dirt cheap and very fast acting.
The Golden I board and trained in April was pretty lame and awkward with HD last winter. He was diagnosed at just under a year with HD. His whole back end looked loose. He couldn't jump into the back of my van (quite low). He was also quite chubby and very tall for a Golden. After
4 -5 months on anti inflammatories (he did the monthly injection of .... cartrophen I think) and getting his weight down, some gentle excercise and physio, he is a new dog. It was quite amazing to see how getting him slim and fit changed everything. Going from 90 lbs to 85lbs made a huge difference. I think he also just needed time for his body to adjust to his growth spurt. Anyway, that's just my personal experience but I thought it might offer some hope.