I also had the Synvisc one shot 3 weeks ago. Hurt like hell is not even close to describing how much it hurt! The pain was incredible. I like to think that I'm pretty good at handling pain, especially after the ACI surgery and osteotemy, but this was intense. Fast forward 3 weeks to today, and I don't think it was worth the pain. I still have pain when walking up and down stairs( more so down ), cracking and popping still, and I can't sleep thru the night. My point isn't to complain, but to share the experience for people who may be on the fence. I should have waited for my next surgery instead.