Hi,
Due to the risk of swelling, if you have broken a bone and have been fitted with a plaster cast you cannot fly for 24 hours if you have a flight of two hours or less and 48 hours for longer flights. Check with your airline immediately!
This has just happened to a friend of mine. His airline says they won't take him on his booked long-haul flight in a couple of days time because of the risk of DVT.