I had them in both knees this morning, only local anesthesia (some kind of icing liquid). 2 more sessions coming up, next is in 2 weeks.
They are supposed to help rebuilding some of the cartilage I used up while walking many pounds around 
Did I tell you the latest from the fitbit? In 2 years I crossed India in terms of distance I walked...
And I was very scared of the pain, knowing a viscous liquid is being pushed in a limited space.
It was not painless, but it was quick; the doctor was talking to me trying to get my attention away from the pain, and I told him " sorry, I am doing my breathing exercise", and he said "great, some patients are holding their breath, and that is not helping".
And I did not tell him, but it is quitting smoking which forced me to master the technique, and the free meditation exercises I learned while quitting.
Hopefully by the time the nice weather is back in AZ my knees will allow walking again. So looking forward to that!!!
