The Inverted W
The Inverted W is the term that is used to refer to a family of
problematic pitching arm actions. These arm actions include the...
The Inverted W is primarily responsible for the injury
problems of a large number of pitchers, including...
As I explained several years ago in my
of Mark Prior's pitching mechanics, and more recently in my
analysis of Stephen Strasburg's pitching mechanics, the
Inverted W contributes to injuries in pitchers by creating a
The Inverted W increases the likelihood that the
pitcher's arm will not be in the proper position when their
front foot plants and their shoulders
start rotating. That will increase the load on the elbow and the
shoulder, providing a short-term velocity boost but, in the long
term, significantly increasing the risk of injury.
a result of the recent discussion about the baseball
pitcher injury epidemic, I have put together a piece
The Epidemic that gives my view of what is
happening, why, and what coaches, parents, and
physicians can do about it.
The idea that the Inverted W is problematic is controversial,
and I have addressed some of the objections to the theory in my...
However, in an effort to convince people that the Inverted W is
indeed the problem that I say it is, I am in the process of
putting together an...
...that goes into much more detail about why the Inverted W is
problematic, how to prevent it, and how to fix it. One of the
things that I discuss in that webbook are some of the relevant
If you are interested in helping to fund this project, I have
put together a page for