NY Times Magazine Link
"About a dozen years ago (Dr. James) Andrews noticed a trend — the number of teenage patients seeing him for shoulder and elbow injuries had begun to rise. In 2001 and 2002, he performed a total of 13 shoulder operations on teenagers. Over the next six years, he did 241 such operations. The surge in the number of Tommy John elbow operations was every bit as drastic: 9 from 1995 to 1998, 65 over the next four years, 224 from 2003 to 2008."