I sprained and broke my ankle while practicing. Timing miscommunication with partner and bad balance...he thought we were stopping when I tried to do a step that I couldn't balance without him. Fell hard and turned my ankle.
I was on crutches for a week or two and went back to dancing after about 6 weeks. The fracture was not detected so it was just diagnosed as a sprain. I continued having pain and instability, but everyone had told me that sprains take a really long time to heal, so I thought it was normal.
Re-injured it 10 months later just doing a random step where I happened to turn my ankle. The x-ray caught the fracture this time (and showed that it was an older fracture), and I had also completely ruptured a ligament and sprained another. During the course of recovery, I also had a pinched nerve in the same foot and Achilles tendonitis.
Recovery: 7-8 weeks wearing a boot, 5 months of physical therapy, cortisone shots. I went back to dancing (in flats) about 3 months after the injury and had worked back up to heels about 2 months later. First competition was 8 months post-injury.
No further problems so far, knock on wood!