Any ideas...

I had something similar happen to my right lower leg as well, due to crush injuries, amazingly though the bone wasn't fractured, but I developed compartment syndrome and they had to cut through (and cut away) some of the muscle at the front of the tibia and inside my calf, still gives me horrible pain to this day now and again (and the incident happened nearly 6 years ago).
I console myself with the fact that i'd rather be in excruciating pain once in a while than have lost half my leg, although I do have a delightful frankenstein skin graft on the front of my leg thanks to the really heavy scar tissue build up underneath, just remember to keep stretching all the time, every single day, and massage it as well, all of this will also help a lot.....and if all else fails, HTFU ;)

yep, my scar isn't pretty either! we can compare if you are at south drinks on monday... although they have done pretty well with the shape - it looks good at the top, it's just a bit thick at the bottom - but my ankle will always be fat anyway due to all the soft tissue damage it sustained around the joint (basically screwed every tendon and ligament).