Tommy John injuries in pitchers can stem from a lack of external shoulder rotation, forcing the elbow to compensate and increasing strain.

“Like where we have pitchers, who can't, I'm always fascinated by guys that have Tommy John issues in their elbow, right? Pitchers. Like if you can't externally rotate the shoulder that we talked about, again, the ability to get your shoulder back into external rotation. Well, your arm has to get to a certain position for release of the baseball. And if it can't get there, if you can't externally rotate the shoulder to get there then the elbow has to sort of torque more in order to allow the arm to get back further.”