RA Dickey, and How Less Can Be More

No matter how you look at it, RA Dickey‘s career has been nothing short of remarkable. From a fireballing first round draft pick of the Texas Rangers after an illustrious collegiate career at the University of Tennessee to the knuckleballing Cy Young Award winner we see in front of us today, Dickey’s career path has been rife with detours and lessons in perseverance. Those lessons have been at the hands of the ulnar collateral ligament that he does not have in his pitching elbow – a fact learned after a team doctor noticed Dickey’s arm hanging in an odd fashion in a picture shoot for a Baseball America cover, prompting an exam, and revealing the lack of ligament.

In spite of the missing hardware, Dickey has made quite a name for himself after an inspiring metamorphosis into a knuckleballer, culminating in adding some baseball hardware to his collection, in the form of the NL Cy Young Award last year. His baseball rejuvenation has been performed with style and aplomb, and in a way opposite that of most knuckleballers in MLB history. It has been noted by many that Dickey’s knuckleball is one of the hardest thrown ever, and adds to the effectiveness and mystique of Dickey’s pitching repertoire, and to the awe induced by these kinds of results:

A quick table, courtesy of Texas Leaguers, shows us the ‘career’ PITCHf/x data of the 3 knuckleballers that have made MLB appearances since the technology was installed and data was offered to the public, around 2007. As you can imagine, data is scarce, not only because there are so few knuckleballers, but because the technology is so new; as an aside, it would be a real treat to see PITCHf/x data on some old timers, like the Niekros, Wilbur Wood, Charlie Hough, and Hoyt Wilhelm. Next lifetime, I suppose. On to the table!

Player Type Count Velocity Vertical Horizontal Spin Angle Spin Rate
Dickey KN 7454 76.2 0.64 0.19 182 874
Wakefield KN 8567 65.8 2.01 0.97 117 656
Haeger KN 704 70.5 2.85 0.18 159 753

As we see, his average knuckleball velocity is quite faster than Tim Wakefield or Charlie Haeger, but I want to focus on the reasonably large disparities between Dickey’s knuckleball spin angle and spin rates. While I don’t confess to being either a PITCHf/x or physics guru, it did set off a bell in my head.

Could RA Dickey’s success with the knuckleball, along with his ability to throw it with such great velocity and at the spin angle and rate he does, be a result of his not having a UCL in his pitching elbow?

The UCL is a critical piece of anatomy in baseball, as it provides the lion’s share of stability to the elbow in athletic activities, like swinging a bat or throwing a ball. It is considered a valgus stabilizer, which is fancy medico-speak meaning the UCL helps keep the elbow in place, and not become displaced away from the midline of the body. If you can imagine your arms resting at your sides, it’s the UCL that prevents your arms being splayed outwards at the elbow.

With that in mind, and looking at the PITCHf/x data, in particular the spin angles and rates, we can see where possibly this increased anatomical freedom at the elbow joint could provide Dickey with an advantage in throwing the knuckleball, a pitch that is notorious to master, due to the necessity of the pitcher to minimize wrist flexion in order to produce the ‘spin free’ results that are desired. Could additional laxity of the elbow joint be somehow advantageous, possibly in the deceleration phase, and give the pitch a little more oomph, not only from a velocity perspective, but also from a pitch movement perspective? I leave it as an open-ended question, and welcome smarter folks than I to provide their thoughts and input.

Sometimes less can be more; for Dickey, his career less a UCL had given him more. More velocity, notoriety, and accolades than his fellow knuckler brethren ever garnered in their careers.


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