Patrick Schwarzenegger -- Injured in Ski Accident

Patrick Schwarzenegger was treated in an Idaho hospital after injuring himself skiing yesterday ... continuing the Schwarzenegger family tradition of sports injuries.

The 18-year-old son of Arnold Schwarzenegger and Maria Shriver tweeted a few photos after the accident, saying, "Little ski accident today. Some bruises and stiches down back and but. Thanks to sun valley doctors for everything."

The Schwarzeneggers are no strangers to sporting accidents. Christopher Schwarzenegger was in a serious surfing accident last year that landed him in the ICU for several days. The Governator himself broke his leg in Sun Valley as well back in 2006.