A few folks at my US rabbit site swear by acupuncture, but I do not have anyone who practices that here.
So I've mostly gone the metacam route (up to 0.2 ml daily of 1.5 mg per ml concentration, either all at once or in two 12 hour doses depending) and I also watch my weather carefully. As the temp goes down and/or the humidity drops, or makes wild swings in the opposite direction, my bun is in worse shape. He is only 4 years old (an estimate since he was a rescue) but has been confirmed to be in the beginning stages of arthritis in his hips by xray. To see him just be a shuffle bum round his habitat is heartbreaking, when I recall him taking running binkies in and out of his shed/outdoor run when I first got him. And he also has issues with pottying outside his litter box because I can't find anything low sided enough for him to feel comfortable getting in and out of.
I had not heard of the pomegranate being good for this, nor the celery/parsley. (Totally doubt I could get Mimzy to swallow watercress, can't stand it myself!) I may give those a go. Any idea how much pom juice they can have or is there a powdered something that would be better?
I've also tried to get him to take myristol pellets (cetyl-myristoleate and glucosamine chondroitin formulated for bunnies) but they seem to upset his tum and so I can't seem to get them into him for more than a week at a time, which of course is no good as it takes about 6 straight weeks of therapy to see a change.
He used to have a multi-level home that I had to make into a simple ground floor residence, since I feared his legs would not get him to the second level and he would fall, possibly breaking something vital. It wasn't worth the risk to me, but he's been so sad ever since he lost his favorite ramp and sleeping shelf.
Wish I had a magic wand to reverse it all. He's entirely too young in my opinion to be feeling this creaky.