Hi,
I had ostenil injuctions about six months ago. Following a anthoroscopy to mend a lateral meniscus tear. The reason i had the injections was because i was still getting slight locking symptoms post-op. The injection itself did hurt a little, and also made the knee sore for a couple of days. I had a course of three injections over three weeks. After i had completed the course i found that the symptoms stopped. I think that these injections do have some short term effects over a six month period or so, they don't seem to be a long term solution if you have serious structural problems with the knee. But in the words of my physio, it can't really harm the knee, if it aids the knee even a little by increasing synovial fluid etc then it can only benefit. Obviously you have to seek medical advice to make sure that the injections don't hide any long term problems.