Thanks to Zane Kelly, the Director of Strength and Conditioning at Athletes In Motion, for sharing this article. Below is his reaction:
1) Having Tommy John myself valgus stress bothered me after my tear but adding supination to the stress was the OUCH. I would argue breaking balls are harder on the UCL than fastballs.
2) I agree with Dr. Timothy Kremchek.
3) 70% of Tommy John surgeries being performed on pre-collegiate kids is insane. What are these kids doing to save their body and prepare to throw. I would say most kids (ages 9-17) are not doing enough to get ready for the season (are you strong enough where it counts).
4) Pitchers should not play Catcher (as a general rule). Some guys in the HS level need to determine which position gives them the best chance to play at a higher level and go with that rather than risk having an arm (or hip) injury Pitching and ruin their Catching future.