I have chronic post op knee pain and swelling after 4 reconstructive surgeries. I am a machinist and must go up and down steps into and out of a large machine all day. I am seeing a pain management physician and have tried nerve stimulator, pain patchs and percoset. Currently I am using the knee patches but feel like the long term use of percoset is causing me to have other health problems, i.e. ?liver damage, erectile dysfunction, etc. I feel I can't function on my job without the percoset and am wondering whether a nerve block or total knee replacement is an option? I desperately need advice, I am addicted to the percoset and am currently trying to stop using it "cold turkey"