I had a heatk attack on May 2, 2017 and a stent placed. This is my 5th heart attack and 14th stent. On December 30, 2017 I fell and injured my knee and if it requires surgery can I safely have it done. I also need surgery on a broken collar bone. I take an baby asprin a day and one tablet of clopidogrel 75 daily. Can I safely having surgery?