This reminded me of an article in SI by the great Tom Verducci about Tim Lincecum in 2008. He won the Cy Young that season and in 2009; by 2012 his career was effectively over.
Throwing a baseball is an act of violence that has been graphically defined by Dr. James Andrews, Dr. Glenn Fleisig and the other doctors and clinicians at the American Sports Medicine Institute (ASMI) in Birmingham. From the loaded position, the shoulder, at its peak speed, rotates forward at 7,000 degrees per second. "That," Fleisig says, "is the fastest measured human motion of any human activity."
While in the loaded position, the shoulder and elbow bear the equivalent of about 40 pounds of force pushing down. When the ASMI biomechanists wanted to know how much more force an arm could take, they brought cadavers into the lab and pulled and pushed upon the elbow joint to find the breaking point. The cadavers's ligaments blew apart just after 40 pounds of force. "So a pitcher is just about at the maximum," Fleisig says.
As if peering around a corner, the Freak tilts his head slightly to the left as he begins his explosive, homemade pitching delivery. What lurks around that
vault.si.com
He was one of the first to truly train for velo. I think he was involved with those guys who ultimately became Driveline.
Funny thing is now, they are trying to find some type of training method to mitigate the TJ risks. They are really big into weightlifting and strength and such. Who knows if they'll be able to do it, because like you said, that joint just isn't made for throwing 95-100 unless you're one of the true freaks like Nolan or Pedro.
Many people still blame high pitch counts and while that is bad, it's bad for the elbow AND shoulder, and just overall liveliness. Velo, and velo when fatigued, in normal pitchers, is what's killing the UCL. To me it's akin to Ronnie Coleman pushing all that weight on squats on those years....high quads could handle it but his spine could not. That's why I don't advocate for wraps or belts when lifting weights. If your weakest point can't handle the lift/stress, you ought not be doing it.