It's like a miracle drug. Until it's not. Unfortunately, they never know when that point will come. Some people get months of relief from their first shot. Others get nothing. But however much relief you get from the first dose appears to be your maximum. You might get the same results in the future, but never better.
It's why I take boron and Comfort Max (from Life Extension). They support the body in reducing pain from joint inflammation, without masking symptoms, so I don't overdo and damage myself. And massage to keep the muscles loose.
But I'm glad you're feeling better!