I have been receiving Synvisc injections every 6 months for the past two years, and until recently have not experienced any problems. After some swelling following the last series, I began to question the method of administering these treatments. Although some pain and swelling are noted side-effects, I wonder if all precautions are being taken with the injection. Synvisc clearly indicates that synovial fluid is to be removed before each injection, yet my doctor has never done this. He has passed my questions off as something that is not important and said that the Synvisc is intended to mix with the existing fluid -- as a supplement, and that it is an unnecesary procedure. My questions are: Are there any indications that failure to remove the existing fluid is problematic for most patients, or is he just being lazy? Thanks for your help and advice.