Make sure you get tested after surgery. I have Factor V Leiden and MTHFR methylenetetrahydrofolate reductase......LOL what a mouth full! It runs rampid in my family. I have not had a clot yet but my mother has had a PE and a DVT and my grandmother we believe died from a Massive PE. Didn't have an autopsy. One of my daughters has Factor V and the other is homozygous for MTHFR. Probably in your case just venous tos but always best to know about these little bugger clotting issues especially if you have experienced a clot. Good luck with your surgery!!!!!! Keep us posted