Mark Prior's New Pitching Mechanics
It turns out that Mark Prior is
working on his pitching mechanics, hoping to make a comeback.
While he has made some changes, they are unfortunately largely
cosmetic and thus are unlikely to significantly improve his
long-term prospects. The problem is that, while Mark Prior no longer makes
Inverted W, he still has the same timing problem.
In video clips I have seen, Mark Prior's PAS upper arm is
at 0 degrees of external rotation at the moment his Glove Side
(GS) foot plants rather than 90 degrees of external rotation.
This is due in part to how late Mark Prior breaks his hands. His
Pitching Arm Side (PAS) forearm, given his arm action, simply
doesn't have time to get up to the proper position by the time his
GS foot plants. This will increase the load on his elbow and his
shoulder and should put him back on the DL.
For Further Reading
If you are interested in Mark Prior's Pitching Mechanics,
I have put together a number of pieces that address different
aspects of the story...
About The Author
Chris O'Leary never played baseball beyond grade school due
to a shoulder injury suffered due to poor pitching mechanics. As
a result, he is focused on ensuring that what happened to him
doesn't happen to anybody else.
The Epidemic is one way he hopes to achieve that goal.
 As I say in my pieces about the inverted arm actions --
and Inverted L
-- what is bad isn't really the arm action itself. Rather, the problem is
that these arm actions increase the likelihood that a pitcher will
develop a timing problem, and a timing problem (aka
rushing) is the thing that
kills pitchers' elbows and shoulders.
 The fact that Mark Prior hasn't pitched
at a high level in a number of years may actually work to his
advantage for a while (up to a couple of years). Serious injuries
take serious amounts of time to recover from, which Mark Prior has
gotten. However, nobody has addressed the root cause of his
problem -- the timing problem -- so Mark Prior's problems are
going to crop up again.