when i had shoulder surgery, i had to write out a list of every drug i had taken in the last year, and various steroids were on the list and the doctor gave me about a 2 hour lecture and then he tried referring me to a drug counselor. stupid! but, you should tell them because there are all sorts of weird things that can happen when you have surgery and i figure if you are going to have that done, telling them everything might decrease the chance of something bad going wrong.