The swelling is more from the ankle ligament and soft tissue trauma. It may well swell for several months and aroubd the actual ankle it may always swell relative to the other side. Swelling is also caused from the reduced activity as the body relies on the muscle pump of the calf and foot muscles to push it back out from the extremity. This means until youbare walking as per normal it will swell (just like peoples extemities swelling on a long plane or bus ride). Patience is all you need as swelling in of itself is no means for concern.