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Arm Slot refers to the angle, relative to the ground, that the pitcher's arm comes through at the Release Point. In the best, healthiest pitchers, Arm Slot is determined by Shoulder Tilt; the Arm Slot rises as the pitcher's shoulders tilt.

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In the picture above, Johnny Cueto is demonstrating a very typical three quarters Arm Slot, as in three quarters of the way up between submarine and overhand.

That's important, and I mention it, because, by mandating a pitcher's Shoulder or Head Tilt, as Tom House does, you — by necessity — are forcing them to throw from a certain Arm Slot. That's a problem due to the relationsip between Arm Slot and injuries in kids, at least.

In general, a pitcher's Arm Slot isn't a huge contributor to injuries.

In adults.

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As a result, Arm Slot isn't my main focus, at least when it comes to injuries.

In adults.

However, there is some evidence that lower Arm Slots — low 3/4 and sidearm — are bad for kids, at least.

For instance, according to The Relationship of Throwing Arm Mechanics and Elbow Varus Torque...

Contrary to the hypothesis, decreased arm slot was also associated with increased elbow varus torque.

And, anecdotally, I hurt my arm tryng to throw sidearm to submarine, so I taught my boys to throw more over the top.

I summarize my work on pitching injuries in The Epidemic.

Myths

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The origin of this piece was a few years ago when I was going through my files and came across an article in which the author described the three different arm slots...

  • Overhand
  • 3/4
  • Sidearm
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As I read through, I found there were a couple of problems with the assumptions that underlay the article, starting with the relationship between Arm Slot and Elbow Angle.

The first problem that I had with the article is a minor one. generally, there are four main arm slots that pitchers throw from...

  • Overhand
  • 3/4
  • Sidearm
  • Submarine

Of course, the truth is that there are an infinite number of arm slots ranging from 45 degrees below the horizontal (submarine) to 75 or 80 degrees above the horizontal (overhand).

The bigger problem I had was how it described the 3/4 arm slot and, in particular, how it is achieved.

In the picture that accompanied the article, the author described the 3/4 arm slot as one in which the shoulders were horizontal, the Pitching Arm Side (PAS) upper arm was also horizontal (such that the PAS elbow was at the level of the shoulders), and the PAS forearm was vertical (with the PAS elbow bent 90 degrees).

The problem is that this isn't an accurate description of the 3/4 arm slot because it isn't physically possible. There is no way for someone to throw (at speed) while keeping their PAS forearm vertical.

Instead, as the shoulders start to turn, the PAS forearm bounces or lays back so that it is horizontal (but still level with the shoulders). The PAS elbow then rapidly extends as the shoulders start to slow down. As a result, if their shoulders are level, then someone who thinks they are throwing from the 3/4 arm slot is actually throwing from what could be more accurately described as a sidearm arm slot. The only way to actually throw from what could be described as a 3/4 slot is to tilt the shoulders 45 degrees.

Arm Slot - Reality

That is what Jeff Suppan is doing in the photo below; tilting his shoulders to raise his release point.

All of this reflects what I think is a bigger problem with the state of the art of pitching instruction; I don't think many pitching instructors really understand what the body does as the ball is thrown. As a result, they sometimes give advice to people that is out of touch with reality. They also make statements like 'arm slot is genetic' when the truth is that changing your arm slot is as simple as tilting your shoulders more (or less).

What The Pros Do. Actually.

Let me illustrate what I'm talking about with some photos of major league pitchers.

Johnny Cueto

First, it's insane to judge Arm Slot unless you are looking at the pitcher head on or nearly so.

A head-on view of Johnny Cueto shows his High 3/4 Arm Slot, but that's only clear because we can see both his shoulders and his shoulder tilt.

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Sandy Koufax

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A head-on view of Sandy Koufax shows that he threw from a VERY High 3/4 Arm Slot, if not Overhand.

The same is true of Clayton Kershaw; note his steeply tilted shoulders.

Randy Johnson

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Randy Johnson was the prototypical sidearm pitcher.

As you can see in this photo, his shoulders — and thus his PAS upper arm and forearm — are level as he releases the ball.

Greg Maddux has a fairly pronounced shoulder tilt and could be described as someone who threw from a 3/4 arm slot.

Hideki Okajima

Hideki Okajima is another example of a pitcher who could be described as throwing over the top. Notice how much his shoulders are tilted in the photo above.

This picture also shows the potential problem with super-high arm slots.

Head jerks.