I didn't know that either. It must not be a HUGE concern since I had ankle surgery last year and was in a cast on bedrest for 6 weeks and immobilized for another 10 weeks and I just was on aspirin instead of a stronger blood thinner. Good to know though; being casted so long blood clots become worrisome and you can't see inside to know what is happening. I had a big bruise from a tourniquet and worried about it for a while. Then I'd just gotten a little more relaxed in a walking cast and my family dr warned me to be careful of clots because his sister had one with long-term casting and I started making people look at my toes again (they were in the cast so I had virtually no way to see any signs of trouble). Of course it was all fine.

I'm sorry you have a DVT and have to deal with the blood thinners. That's never fun. Even the aspirin wasn't much fun and that was not exactly heavy medicine but I bruise easily anyway and with the aspirin I bruised constantly whenever I banged a cast into my other leg.