I don't know what stage 1 HD is. My 9-year-old dog has HD, hers was graded as Mild by the OFA, not with a number. Is your dog lame? In pain?
Both of my adult dogs have had laser therapy for injuries. It did help to reduce the inflammation. I would also suggest, if you're not already doing this, finding a good daily joint supplement. I have Brandy on Glyco-Flex III, salmon oil and 1,000mg of Vitamin C daily for joint support. She also does hydrotherapy every other week. If your dog is lame and/or in pain, you might want to look into Adequan injections as well.