the Knife

Hi Will,

I very much enjoy your columns (especially the recent labrum article) and
appreciate your work in getting the latest baseball injury info.

I have a question about the shoulder subluxations suffered by
Richie Sexson and J.J. Hardy. What
exactly is this injury? Perhaps you could dedicate a paragraph in an
upcoming article to explain exactly what has happened and what will be
involved in their recovery.



This would be an easy one to describe in person–harder in e-mail.

OK, take one hand and make a “C” or cup with it. Take your other
and make a fist. Put the fist in the C. That’s a shoulder. The C is
the glenoid fossa; the fist is the head of the humerus. It would take
a lot more hands to imitate the muscles, labrum, etc, but that’s not
necessary here.

The shoulder can rotate in any direction, but when the fist comes
of the C, that’s a dislocation/separation. If it unseats, but doesn’t
quite come out, that’s a subluxation. You’ll also hear it
called “partial separation” and “popped in and out” but that’s the
basics of it.

–Will Carroll

Mound History

Was there a time at the beginning days of baseball when the
mound was closer to home plate than it is now?


Sort of.

In the really old days, there wasn’t even a mound, just a line on
flat ground that the pitcher had to stand behind when he pitched, and
it was ususally 45′ away.

By the 1880s the line turned into a box, and the pitcher had to stay
inside of the box the entire time. Prior to that, they had been taking
long running starts up to the line, like a cricket bowler still does
today. The box cut him down to a two-or-three step delivery. The front
of the box was 50′ from home.

Starting in 1893, the pitcher was required to pitch from a set
position off of a slab of rubber 60’6″ from the back of the plate, and
that rule remains the same today. Notice that 60’6″ now defines the
distance to a pitcher’s *back* foot, while the old rule limited the
placement of his *front* foot, and so the change isn’t quite as
dramatic as it first appears.

Sometime in the 1880s the pitcher’s area began to be built up into a
mound, but by whom and when is uncertain. The term “mound” doesn’t
appear in any rules until 1903.

–Clay Davenport

Trasaction Analysis: May 25-27

In response to your reference that J.T. Snow
is ‘a useful platoon source of OBP,’ I am not sure the stats bear that
out, as Snow has a higher OBP against lefties than against righties. If
Snow is in the lineup because of his OBP, then there is no reason to
platoon him.

— S.S.

The nice thing about limited sample sizes is that they’re limited.
Snow’s OBP over the last three seasons (from superficially supports what
you’re saying, but let’s take a more extended look at Snow’s platoon
data over the last six seasons:

2003 (AVG/OBP/SLG, PA)
vs. RHP .284/.387/.450 ~337
vs. LHP .208/.387/.229 ~58

vs. RHP .250/.336/.347 ~400
vs. LHP .228/.382/.429 ~88

vs. RHP .233/.368/.377 ~285
vs. LHP .306/.386/.388 ~55

vs. RHP .292/.370/.479 ~462
vs. LHP .256/.351/.395 ~140

vs. RHP .292/.394/.501 ~469
vs. LHP .231/.313/.331 ~187

vs. RHP .265/.347/.459 ~410
vs. LHP .164/.259/.247 ~83

Now, reasonable people can disagree. You might want to operate on
assumption that his injury-marred 2001-2003 seasons kept him from
up at-bats against lefties. However, in previous seasons with more at-
bats to give us a more comprehensive picture of Snow’s batting against
lefties, I see a guy with a significant platoon problem. Even if you
accept the limited samples of the last three years, you’re talking
about a first baseman who doesn’t hit.

There’s another question about the recent data against lefties, as
whether or not they’re representative of Snow’s skills. Take 2001, a
year where Snow hit “well” against lefties. He actually spent the
season being platooned with Andres Galarraga, so he barely played
against them. Without digging up the game data, I’d suggest that he
probably didn’t see a lot of lefties in game-critical situations if the
Big Cat was available, but against second lefties, or with a big lead,
a manager might prefer to leave well enough alone. So I’d speculate he often
wasn’t seeing the best left-handers, even when he was allowed to face
them. But that’s speculation, and this is a quick response to a good

–Chris Kahrl

Baseball Prospectus Chat: Grady Fuson

In his chat
with you Grady Fuson says that he’s never met me. What’s odd about this
is that I have met him. I interviewed Fuson, at great length, in the
summer of 2002, in a Rangers dugout.

–Michael Lewis