Hi Lovelyladi...I'm Jenny...survivor of 14 knee surgeries including having both replaced at the same time(a procedure which requires much insanity).
Both Synvisc and Hyalgan had just come out the year before my replacements so I tired both...one in each knee. Turned out I had a massive bad reaction to Synvisc so if you are prone to allergies or bad drug reactions, consider Hyalgan. Synvisc takes 3 shots but Hyalgan takes 5 so insurance companies will scream(costs 2 extra office visits!)
But I can report that even with knees on the verge of replacement, it bought me valuable time. But don't make the same mistake I did. I felt so good I over did it and ended up fracturing the surface of my knee joint(got picked up by a big wave and slammed down), I never would have gone in the ocean without the shots......I felt that much better.
So I'd say do it. You can get 6-12 months from them and then do it again and again until it no longer works...then replace the knee. Knee replacement is very painful surgery so it helps if you are in lots of pain beforehand. I was and despite the surgery pain, I was in less pain a week after surgery than the hours before. I LOVE my knees
Good luck and if you have any more questions, I'm always around.
Recently Synvisc One was released. Instead of a series of 3 shots it is one injection. I would try these (Synvisc or Hyalgan) but my insurance wont cover it and I don't have the funds to pay for it out of pocket right now. I have a friend who has used Synvisc with great success.