My experience:

I injured my knee running errands in the car (in-out-in-out-in-OUCH!).

I got a cortosone shot and a brace which made everything all better. The shot was all but painless, excepting for having the doc poke around looking for Just The Right Spot. Evidently, her technique is good, relief was immediate. I only needed one shot - then used the brace 'til I got tired of the thing.

I don't really want more of them, it felt just too darn good to be good for me.