I was amazed when my wife needed a total hip replacement here in the UK a while back after a nasty NoF break - the Consultant was having to deal mainly with knees. The knees of people far younger than I would expect. OK, some were having a re-line of the joint, but most were total. We were told that two issues were the main feature, the over-weight/obese & runners - runners that mainly pounded the roads doing anything from 10k upwards.
Getting weight off, before the op seems a no brainer, when it makes both surgery & the likely recovery time so much easier....if only life were that easy.
Running, well it seems those who run/jog throughout their adult lives usually get a better deal from the bodies repair mechanisms. It's the more occasional exercisers, who commit to say a few Charity runs each season, who seem to suffer most.
Still, life remains a lottery, as does the result of surgical intervention on this scale - all the best to any of you either waiting, or recovering. Don't sell the bike whatever you do, it's one of the best recovery tools in the box.