Sorry in advance, this is ridiculously long but I need to get it all out.
Just over a week ago 15yo PolterCat came in unable to weight bear on his back legs, which looked wonky, and he was clearly in pain, no signs of RTA, but very reminiscent of cats who've broken their hip/pelvis. Emergency trip to vets who found 'thickening' in both back knees and suspected arthritis which he'd exacerbated with a fall/jump/fight. Given Loxicom jab and a weeks worth to give at home. He was much better the next day and by day 4 he was darting up the stairs as usual.
Saw vet on day 4 who seemed surprised and pleased how much better he was, vet did a more thorough exam now pain was gone and is pretty sure it's arthritis and PolterCat might need med's long term, but to see how he goes.
We've kept him in all week, he has access to a walled courtyard for basking and he seems happy enough. He'd never lived in a house until we got him from rescue 6 years ago and has always had free access to outside, but we plan now to keep him in at night and see how he goes in the daytime. He's popped out for a poo but seems to have decided that he prefers the litter tray for wees.
Vet mentioned x-rays, but seemed quite pragmatic, I'm not sure I'd want to risk a GA at the moment when PolterCat seems fine, and I'm not sure it would make any difference to treatment if arthritis/dodgy bones/joints was confirmed.
Would love to hear how others have dealt with similar. I don't want to be over-protective, but I also don't want to risk further injuries.