Injuries are the part of every sports or physical exercise, so what we need always have to be careful while practice and have to follow rules and regulations taught by instructor.
Then only we can have safe and happy practice......
          3 days back i hurt my ankle, due to my mistake, because that time i was not careful and first fell down from stairs, didn't take rest and then again aggravate this injury by "eka pada galavyasana" and got so much pain, but now is recovering m hope within 3-4 days i will be ok and get ready for action.
         This is not the injury from Yoga, this injury is because first i fell down and then didn't listen to the Doctor, and just practice yoga. if one person already injured and practice something then must that injury will aggravate.

have a safe and peaceful practice to you all.

Namaste Ji,
Yogi Manu.