"Before the season started, his mechanics were a cause for concern. Now you know why. His mechanics are very stressful on his body and the body is showing it. He gets his plant knee extended quickly and make his hip control all of his balance and absorb all of the rotational forces in his delivery. Then the elbow never has much flexion in it and kind of long arms the ball. With his elbow so extended, the moment arm of the forces are farther out and requires his rotator cuff to work harder along with the other internal rotators to work harder to turn his arm over. That is why you are seeing shoulder problems."
http://www.crawfishboxes.com/2013-ml...-indiana-state