Pedro Martinez swears that there are ways to throw (and throw hard) and not stress the UCL so much. We've got to get this crap under control, all over baseball. This Latino players play all year round and never hurt their elbow. It's something about American players the way we do things. There's a video on Youtube if you search Pedro Martinez mechanics. Basic tenet is not opening up too quick and using all arm, combined with guys have such big muscles nowadays. And obviously guys are trying to throw much harder than they really can, naturally, which overstresses things - but also gets you paid.
I think most are just thinking TJ is worth the payday.