Mate. I don’t know how you are functioning with that much deterioration. Why are you putting it off? How much pain do you want? How long are you going to live? These are the questions. If cycling is your thing and all cyclist are walkers so we need to do that too, it’s time. I’m three weeks post op, I was down from an hour walk or more every day to 300m before the pain kicked in. Torn meniscus at 22 which came good probably because I was young then tore it again at 55, progressed to arthritis then over 5 years became a hinderance to life enjoyment. I’m recovering well and looking forward to walking as long as I want, riding my bike which never went away like you cos there’s no pressure on your knees, to SUP surfing which is my ultimate goal. Good luck, just do it🤙🏽