I was the first to arrive in Japan before Tomek, Chloe, Iain, Dodie and Evan.
I'm so thankful for JAL for upgrading me, the woman at the counter saw me limping and managed to book me into a seat with more leg room. My leg actually swelled up so much on the flight it was quite shocking so i'm really glad i wan't in a standard seat. I will have to ask if it's possible for a seat i can put my leg up in next time as the flight back is even longer. (context, i broke my leg 4 months ago and it still swells).
If you're flying with a broken leg yourself, i would highly suggest getting some compression socks and taking some aspirin before take off to reduce swelling.