Yep-- I had several pre-surgery. Worked like a charm initially, gradually fading effect/ worn off within two months...had to ration out the rest over the following year with lesser improvement and faster decline each time, but STILL---IMPROVEMENT!!! I was THRILLED with the difference, for as long as it lasted.
Surgery for me following the pain management injections was invevitable, though, due to long term damage from a spine surgery I had as an adolescent. I was just trying to hold off for as long as I could. Probably should have submitted to the second surgery years sooner.