Grade: 1
Hurt left ankle when my left foot skidded going into control #10. It then hurt a fair amount during my warm-down.
I eventually went to physical therapy, and the exercises really seemed to make the ankle strong and well-recovered. Even a year later, it is still possible to tweak it in a way that hurts (and I did this on July 29 during my first day of training in Trondheim for WOC 2010), but it is fine the vast majority of the time.