I'd say you've probably come to the right place for a discussion of HD
My shepherd was diagnosed with HD at about the same age as your dog.
I am not good at reading x-rays, but there are several people on the forum who are.
My dog's left hip is so-so. His right hip is pretty bad- the "ball" doesn't even begin to fit down into the socket.
I immediately put him on joint supplements and I suspect he has a high tolerance for pain because he never yelps or acts like he's painful. The only indication of his HD is a different kind of gait and the fact that our play/training sessions are pretty short for such a high energy breed.
I let him decide when he is done playing and he will grab his toy and head to the house when he is at his limit.
I do have some previcox on hand in case he would need it, but so far he hasn't. He is now 3 years old.
I know there are several people on this forum who use adequan, so hopefully, a little later in the day when most folks get off work, you can get some answers.
I wish you the best of luck with him. It can be a difficult situation to deal with.