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Pitching Mechanics: Joba Chamberlain

As requested, by readers Mark and Heater, I've done some analysis of Joba Chamberlain. Most people are familiar with his body of work statistically, so I'll skip that for this analysis and focus only on the mechanical side of the top prospect in pinstripes.


Source: pitchingclips.com

Unfortunately for Yankees fans, I don't really like what I see...

Tempo/Arm Action

His tempo is pretty good. Depending on when you define maximal leg lift, Joba's anywhere from 18-20 frames into footplant. We'll say it's 19 frames - that's fast, even if it doesn't really look that quick.

However, Joba's arm action is not good at all. There are two major things wrong with it:

1) He has signs of the "Inverted L" and/or "Inverted W"

The "Inverted L" is a term invented by Chris O'Leary. It refers to the position of the pitching arm right before footstrike, and can be a sign of problems to come. The "Inverted W" is when a pitcher brings his elbows above the level of his shoulders in a position of hyperabduction. This can cause impingement problems down the line and also leads to rushing. Here's a few stills of what I mean:


Possible Inverted W


Possible Inverted L

These particular positions are often found in pitchers who have an "elbowy" or "short" arm action, and it's often promoted as a good thing. Who remembers Mark Prior's "flawless" mechanics? Take a look at this:


Mark Prior's Inverted W

We all know Prior's injury history, now don't we?

Here's an example of a severe Inverted L (or as I also call it, "Hung Arm Syndrome"):


B.J. Ryan's Inverted L (credit: Chris O'Leary)

2) His arm is late at footstrike

Problem #1 leads to problem #2 very frequently. In this case, his arm has not passed through the horizontal plane axis of his shoulders at footstrike. This will cause unnecessary force in the external rotation phase of the pitching motion and is evident when you see how far Joba's arm lays back in that phase:

Ball Release / Followthrough

It is clearly evident that Joba has a lightning-fast arm. Check it out:

Unfortunately, that doesn't mean he has a good followthrough phase; he doesn't.

Compare him to a pitcher I like, such as Zack Greinke:

Joba doesn't really do anything I like in the followthrough phase except for slapping his shoulder with his glove, which, to his credit, is quite rare in the MLB. He does a decent job of pointing the PAS shoulder at the target, but he has an abrupt followthrough and doesn't bring his PAS leg up and around his body to give his decelerator muscles a break.

Conclusion

I think Joba's injury concerns are well-founded. He has a lot of the classic signs of hyperabduction, rushing, hung arms syndrome, and a bad followthrough. That he does a few things right and is blessed with obvious genetic gifts does not make him a good bet to avoid serious injury in the future. Throw in some conditioning concerns and you have a legitimate reason to fear for Joba's future.

Star-divide

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Thank you!

I was thinking Joba’s follow-through was “ugly”; like he hits an invisible wall. But your analysis is much more enlightening.

by Heater on Apr 11, 2008 2:22 PM PDT reply actions   0 recs

Joba firms up the glove arm too late and also not very well. An open glove usually indicates a soft front side. You can see this in the picture of the 1st base view you posted. Compare him to a guy like Clemens who clenches his fist and squeezes the glove during the stride. This creates tension in the front side of the upper body and keeps things “tight”. Clemens is already firm when he lands.

Looking at the last 3 frames of Joba going into release, he “hunches” his back. This indicates he has relaxed his rhomboids and most likely elevated his scaps. Elevating the scaps can lead to impingement as well.

He can improve his glove arm action and reduce the extension of his front leg. The glove arm should match the arm slot.

by xv84 on Apr 12, 2008 1:19 AM PDT reply actions   0 recs

“He can improve his glove arm action and reduce the extension of his front leg. The glove arm should match the arm slot.”

That is such a great phrase. I hope you don’t mind if I use it in the future (I’ll be sure to credit you).

by Kyle on Apr 12, 2008 1:29 AM PDT reply actions   0 recs

If Joba never “relaxed his rhomboids”, he would not be able to deliver the ball because his scapula would be retracted. At some point, the scapula has to protract, otherwise the humerus would not be able to rise overhead to get to the delivery point.

And the Rhomboids are not the most important muscles in terms of controlling the Scapula during overhead motions such as throwing – the Serratus Anterior and Lower Trapezius are. They act as dynamic stabilizers in a force couple.

by Chris on Apr 12, 2008 11:31 AM PDT reply actions   0 recs

This is part of a comment I posted where i originally found this article:

I think he’s (you are) looking for something that doesn’t exist. The follow through is a problem, I will admit. But Chamberlain doesn’t make the inverted W. His elbow is BELOW the level of his shoulder, which is exactly where it should be (do a google images search and see for yourself).

The inverted L that he (you) claims Joba makes is just completely false. The motion itself (the L) is a valid criticism of some pitchers, but Joba simply doesn’t do it. Look at the picture where he is trying to show the inverted L…. His elbow is below the shoulder, and it isn’t bent anywhere close to 90 degrees.

The inverted L and W are definitely things that pitchers should avoid doing. And if you (the reader) actually know what he (the writer) is talking about when he throws out the terms, you will see that Joba does neither of them. The only thing that he mentions in the piece to be worried about is the extremely short follow through.

by dan on Apr 12, 2008 11:52 AM PDT reply actions   0 recs

Good stuff Kyle. As I imagine you know, Joba had injury issues at Nebraska. One reason the Yankees were able to get him is he had a mediocre senior season after an outstanding jr. year. Most of this was because of injuries and that was with him only pitching once a week.

One suggestion: Is there any way you can give us the ability to pause and stop the video clips you put up? It’s kind of distracting to see all the movement when I’m reading the paragraph above the video and I’d like the capability to pause at a certain spot of the video to check certain things out.

by Mark on Apr 12, 2008 11:56 AM PDT reply actions   0 recs

I think Greinke is pretty close to perfect…
I do not see a problem with Joba as to stress to his shoulder. He actually gets to what I call the “cocked position” easier tha Wang with less arm drag…
Just my view.

by jose on Apr 12, 2008 7:19 PM PDT reply actions   0 recs

Relaxing/releasing the rhomboids allows him to release the ball, yes. But I am referring to his follow-through. Mike Marshall teaches his pitchers to contract the rhomboids BEFORE release.

If Joba were to contract his rhomboids and “clamp” down the scaps, his upper back would not “hunch”.

by xv84 on Apr 13, 2008 1:16 AM PDT reply actions   0 recs

i agree with you about his followthrough (although i wouldn’t have used greinke as an example – he does come all the way through the ball, but the balance is not there, which is why he falls off to the left, and also allows for inconsistency and even left hip muscle injuries), but the “hung arm” thing is a bit ridiculous. This positioning is what allows him to hide the ball, along w/ his fantastic arm speed, which is why he gets so much velocity and deception. It’s somewhat injury-liable, yes, but so is every high-velocity delivery (except maybe clemens, maybe). There is certainly room for improvement in his mechanics, namely in the followthrough, but there is no real cause for concern otherwise. On another note, I’d love to see analysis of Ian Kennedy’s motion. It looks like he’s throwing the ball with almost no stress on the arm, which would presumably keep him away from arm injuries.

by pete on Apr 15, 2008 10:46 AM PDT reply actions   0 recs

I have a question. Looking at Prior and Ryan and then looking at Joba there are two things that stick out. 1) Joba does not have his elbows as high as Prior does and 2) his right elbow is not as cocked as Ryan’s. He looks more like an inverted parentheses than either an L or a W. Does this observation mean anything or is it just a function of the photos you could get?

by Mike from CT on Apr 15, 2008 11:39 AM PDT reply actions   0 recs

Do Joel Zumaya, please.

by S. Gregory P. on Apr 21, 2008 10:29 PM PDT reply actions   0 recs

I read the comment about him hunching his back, and when I look at the picture, it looks like Joba does this following the transfer of weight to his front foot. In the video of Greinke, it also looks like he hunches his back as a necessary part of the release, as Chris mentioned. It looks to me like Joba’s stiff front leg makes this hunching more pronouced, whereas Greinke keeps his front knee more bent (though it does look weird how he ends up kind of looking backwards at home plate). Any thoughts?

by Dan on May 10, 2008 11:16 PM PDT reply actions   0 recs

And today August 6, 2008, Joba is meeting with Dr Andrews regarding his pitching shoulder.

by Bob Ridenhour on Aug 6, 2008 3:56 PM PDT reply actions   0 recs

Are you forgetting that Prior and Joba have different body types?? Prior is very tall and long limbed, while Joba is compact.

by Joe Argel on Aug 15, 2008 12:27 PM PDT reply actions   0 recs

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