Two recent articles have touched on the concept of injury prediction. When someone cares enough to argue about it, the argument is usually about whether or not it is even possible to predict injury. The argument can be pretty involved, but I believe it's mostly a matter of perspective.
A few days ago, Michael S. Schmidt of The New York Times wrote an article about Stan Conte's injury prediction efforts. Conte is the director of medical services and head trainer for the Los Angeles Dodgers, and he has been working on "a formula that will give teams a competitive advantage and help them avoid players who spend their days in the training room and not on the field." Conte's hands-on experience with players, both before and after their injuries, has given him a uniquely advanced perspective on the matter.
The fact that Conte seems to believe that there is some kind of unified equation for injury prediction leaves me scratching my head. Perhaps something was lost in the translation from Conte's brain to Schmidt's article.
A quote from Conte himself later in the article seems to over-simplify his own research:
While Conte hints at a more in-depth analysis behind the decision, the article barely hints at any variables beyond appearances. Without knowing more, it would be foolish to critique Conte's methods. There is clearly merit to his research.
A similar article popped up three days later authored by Mason Levinson at Bloomberg.com that discusses preseason shoulder strength as a key factor in determining pitcher injuries. The focus of the article is a study that links poor rotator cuff strength to an increased likelihood of injury.
Levinson mentions Conte's work and quotes Conte as saying that he has identified 80 variables that may contribute to injuries. Conte also acknowledges that, of those 80 variables, "five or six represent about 90 percent" of the equation.
In reference to the study, which he had not fully reviewed, Conte said the following:
He seems to be saying that strength is only represented by a single variable among his 80. I sincerely hope that Conte is merely being coy. A single strength variable seems minimalist at best and absurd at worst. Perhaps it can be assumed that Conte is referring specifically to rotator cuff strength, I have no idea.
Essentially, the study confirms the presumed hypothesis that a pitcher with a weak rotator cuff - specifically the decelerator muscles: supraspinatus, infraspinatus, and teres minor - is more likely to suffer a "throwing related injury" that requires surgery.
My initial response to this idea was, "Duh," and the more I think about it, the more I think that "Duh" is the correct response.
Rotator cuff strength is a rough measure of the muscle group's fitness. So poor strength equates fairly well with poor fitness. Poor rotator cuff fitness, by its very definition, means that the rotator cuff is not fit to handle the load it is given.
The rotator cuff is an immensely important muscle group for pitching since it handles the deceleration of the humerus. Pitching with an unfit rotator cuff is a lot like running with a weak hip. Something in the chain is going to give.
A Major League Baseball trainer shouldn't need a fancy equation to tell him this.