previously mentioned in this blog, it has become far too common in young pitchers.
Here is a link to another article about overuse, or "repetitive stress" injuries in young athletes. Amanda Schoenberg writes in the Albuquerque Journal about author Mark Hyman's experience with his own son's injury, and his book on the subject, "Until It Hurts."
I am currently reading the book and will comment on it later. But for now, there is some useful information on overuse injuries in this article. The more informed we are, the better.