I need to know if there is anyone who knows if you can be allergic to polyeurthene. it is in a artificial knee that I have. My left knee has been operated on at least 5 times. The pain won't go away, I have swelling all the way down to my foot. It fills with fluid and sometimes there are blisters that come up through or on top of the surgery scar with water in them. I am allergic to almost everything. life threatening to latex, polyester, 14k, silk/satin, feathers, etc