ScienceDaily (2000-10-12) -- "Swan Lake" and "Sleeping Beauty" may be as tough opponents as the Supersonics or the Steelers. Psychologists trying to understand the factors that put athletes and performers at risk for injuries have found that professional ballet dancers get hurt just as often and suffer just as serious injuries as athletes in contact sports.

http://www.sciencedaily.com/releases/2000/10/001012074634.htm