The Inverted "W"?

The Atlantic:

New York Yankees Joba Chamberlain has a torn ligament in his elbow. This means the two most hyped pitching phenoms of the 21st century, Joba and the Washington Nationals' Stephen Strasburg, have now fallen victim to the same curse: the "Inverted W," or the "Inverted L," or whatever a particular trainer or sports physician wants to call it.

Per the website Texasleaguers.com, the inverted W is the position of a pitcher's arms as he picks up the baseball during the cocking phase of a pitch. When winding up, "the pitcher picks up both of his elbows above his shoulder," creating the inverted W. This puts a lot of strain on both the shoulder and elbow, which many baseball mechanics experts think can tear the ulnar collateral ligament, which stabilizes the elbow.

Baseball observers have taken so long to identify the inverted W because it is a relatively recent development—that is, it didn't come into being until the windup disappeared almost entirely from baseball. Go back 40 to 50 years and look at pitchers like Warren Spahn or Juan Marichal and ask, "Why is it that they could pitch 300 more innings year after year and not hurt their arms?" There are several answers to that question, but the primary one is that pitches used to throw out of a full windup, which took advantage of the momentum of their whole body to give velocity to the pitch. In recent decades, with pitchers more concerned about holding runners on base, the windup has largely gone the way of the two-dollar hot dog. The Inverted W is the result of a pitcher trying to add speed or finesse on a pitch by forcing the delivery—in other words, his arm working against his body instead of with it.

This is not something I was familiar with.  I guess pitching out of the windup should put less strain on a pitcher, since he's using all of his body to gather momentum.  I'll just go with my theory that throwing the ball really hard makes a lot of pitchers arms give out.  100 mph is really hard.