There's another product like this named Suprax (I think) that's chemically the same thing, but it's given in a series of FIVE injections. Just before my WLS, I had this done for the first time 'cause I was basically in a wheelchair my knees were so bad. It got me back on my feet, and when I recovered from surgery I was MUHC more mobile than I'd been for a LONG time.
Since then I've had it re-done twice, and I have no intention of having the knee replacement surgery as long as this continues to work. For some reason, the idea of knee surgery scares the crap outta me. Never turned a hair over having my guts rearranged, but cutting BONE---Yikes!!!