DVT is an issue if you’re immobile for any decent length of time. Your position doesn’t really matter too much. That’s why they want you up and walking immediately as soon as possible after a surgery and why they will often put patients with an extended stay in the hospital on blood thinners.
Dvt would likely be less of an issue with your legs out vs bent at the knee. Less gravity for your heart to fight against.
True, though it would be horrifically uncomfortable to be forced to sit like that for 4 hours without the ability to shift positions.
DVT is an issue if you’re immobile for any decent length of time. Your position doesn’t really matter too much. That’s why they want you up and walking immediately as soon as possible after a surgery and why they will often put patients with an extended stay in the hospital on blood thinners.