Did you have the knee replacement? If so, how are you sure that it's the Iovera and not the surgery itself causing the zingers? Did they start before the surgery? I'm only asking since the TKR groups on FB do have many who didn't have Iovera but have/had zingers and nerve damage from the surgery itself. Also, did you have 5 injections with Iovera or 3? Some surgeons (you have to be either a surgeon; anesthesiologist; pain doctor to give the injections) (except some surgeons allow the PA to do it, not sure I would let them) only do the genicular nerves with Iovera and not the peripheral...if you had 5 injections, it would be both..I'm only asking because I want to be sure before I get the injections before my TKR by asking so many questions..my problem is that pain medication won't work effectively for me, so I'm kind of only at the mercy of the Iovera to work to get the surgery!