There are quite a few theories on this subject. Some think that the year round travel baseball for kids and the impetus to hit 90 on the gun in high school results in damage that doesn't show until later on - either college or pros. Another popular theory is mechanics that result in an "inverted w" and/or "scapular loading" during the pitching motion. Apparently a commonly taught pitching technique results in additional load being placed on the arms for pitchers who don't have the leg strenght to drive the ball. Fascinating stuff - have a look at some of what a google search for "pitching inverted w injury" turns up - again, all theory with nothing settled and no rigorous studies yet done.
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