Well, to sum up a very long story, here it is in an abbreviated version: I was injured at work 3 times in 3 months, all injuries to my knee. Had 2 surgeries (repairs, not replacement). I have had 4 cortisone shots in the knee over the past year and a half. The first couple made it feel a little better for a couple of weeks, then back to swelling, pain, and difficulties even walking. The last (4th) shot actually increased the pain so bad that I almost wanted to go to the hospital (that was about 6 hours after the shot). Thank goodness the pain decreased back to "normal level" by the next morning.
At one year after the first surgery, the surgeon reported that "severe arthritis" has now set in due to the injuries AND surgery! I just completed a series of 3 weekly injections of a "joint lubricant" called "Uflexall". It has a 50/50 chance of providing some relief, but won't know if it works for the next 30 days or so..... Next up is full replacement.
I have heard both good and bad about both the steroids and the "lube", it depends on the person and what is wrong. IMHO, THEY AIN'T WORTH ****!