Just because some stranger who doesn't know you and didn't bother to examine you properly, tells you to lose the sticks, doesn't mean you can't use them. I still use my cane when I need to and will until I don't need to. If I'm having a good knee day, I don't use them; on a day when my knee hurts or is more swollen, I use them. As long as you're still limping and wobble, you need the assistance of a cane or two. Plus, you also have a bad knee that hasn't been replaced so you really need the help. This stranger was obviously going by some formula of when to stop using a walker, crutches, cane, whatever, and didn't factor in (or likely even know) all your other issues.
The other day I was having a really sharp stabbing pain in my upper thigh above my kneecap every time I put weight on my right leg, and I got out my walker for a bit as it was so painful I couldn't walk with just my cane. After that pain stopped, the walker went back into exile. If you need it, use it-no matter what anyone else says. Period.