In reply to broady:
Similar to ripper. Over 8 years in fingers with the nodes for more years than that. My GP said I should stop climbing more than once, but has given up that advice long ago!
My take on OA generally is use it or lose it with regard to the mobility of which ever joint is affected, at a level you can without causing excessive pain and or stiffnes, whilst you still can. Don't just think oh I've got OA so I can't do x or y until you really can't do x or y. I do think you can delay further decline, but you need to work at it.
I'm still climbing (though not as often) and actually climb better (higher grades and I think a better more relaxed deliberate style) overall than I did when originally diagnosed. I climb differently though. Can't really use the pinkies now at all so learnt to relax them when using other fingers on climbs, and most finger jams/excessive twisting/cross loading/ crimping/snatching on the finger joints are a no no for me, but there are often (usually for me) many other styles and ways to climb the same route.
Yes there are cycles of pain/stiffness, etc., that restrict what you can do, but I just get into a habit of extending the warm up phase and lower my expectations on the day. You need to learn how to pace and build in rest period. For example when the fingers are really bad, the day after a climb I have to rest the fingers so no real manual dexterity stuff or weight bearing. I also occasionally use tape on the worst joints to restrict movement whilst still providing support to weight bear in a more static way, if that makes sense.
What do I use? On fingers specifically I get on prescription double strength ibuprofen gel and it works wonders for my fingers. Generally use it after every hard climb session just before going to bed. Otherwise, usual painkillers to allow joints to be used as actively as possible. I also like ice cold water treatment when they have been over worked, and not just an in and out, but extended to get the hands to be really cold to reduce inflammation and pain. Of course most of the time the aim is to keep them warm and supple.
In addition whether there is any basis of helpfulness or it's only in the mind, I have multi Vit supplement, eat lots of fish for the omega 3 & 6, minimise foods that I think cause more problems (yes that includes alcohol), get plenty of rest yet remain active, get plenty of sleep, and have daily excercise program.
Be prepared for good days and bad days, adjust accordingly, and keep going is my thoughts.