No osteo Robin!
No experience with Adequan but there may be other meds / combinations that would work, and in addition as some have mentioned, gentle chiropractic and / or acupuncture.
Rickie has arthritis in his left front leg, and for what it's worth, my vet said that research is showing that a lot of pain meds are aimed at reducing short term pain due to a trauma, for example. With chronic pain (and I am going to get this technically wrong but hopefully convey the idea) the pain transmission sort of rewires itself such that the standard pain meds become less effective. He mentioned a name for this which I have forgotten. The treatment approach is to combine meds, and, assuming they work, see after a period of time, if two will work alone if one is withdrawn. Rickie is just starting a combination of Metacam, Tramadol and Amantadine, which I think is similar to Gabapentin (a nerve blocking agent). We will withdraw the Amantadine in 3 weeks and see how things go.
We will check his bloodwork every 3 months to ensure we catch any organ issues early, and I think I'll pick up some milk thistle for his liver in the next day or so.
Fingers crossed for Phene!