Has anybody gotten a cortisone(steroid) injection on the foot? if so, did it work for you?

I have. It worked very well for a short period of time. It didn't cause any damage or addiction, but it's not permanent relief either. I know some people who get them somewhat regularly.

Never got one in the foot, but used to get them in my knuckles due to bone spurs due to excessive steering wheel vibration in my 1965 MGB.

I gave had multiple injections in my back. They work depending on the problem being treated