Raustyk did that to both back legs, I had them both repaired.

There really is nothing more to do. Just keep him confined, less active.
The longer he goes with it un-repaired the more of a chance he has at developing arthritis in that leg. If it's been a year he most likely already has arthritis. Raustyk went only 5 months before her first one was repaired (cause I was in the hospital having my own surgery) and when they went to operate they saw that arthritis already kicked in.
I'm not trying to scare you , just prepare you for what is to come.
The second one she had operated on within weeks of her first symptom & the Dr. found a TINY bit of arthritis starting but not bad at all.

I'd get him on some supplements for arthritis, like glucosamine & chondrotin. Some food have that added into them alread, especially the large breed &/or senior foods, but you still may need to add a little more.

I'd consult with your vet first, maybe they make a payment plan?

I really wish I could offer you more. Good luck with the cutie!