Exploring the Matsuzaka injury

Recently we learned that Daisuke Matsuzaka admitted to hiding a leg injury that occurred in the World Baseball Classic from the Red Sox. Matsuzaka said the injury caused him to overwork his shoulder to maintain velocity and that by admitting to his injury, cause a limit in his training that would have made him not available to the Red sox in his expected full capacity. Matzusaka also claimed the injury was not so much a physical problem but more a struggle mentally to prepare for his starts and overcome the nagging pain he would be forced to endure.

But I couldn't use my lower body well, and I could not use my full body to generate the power. My fastball was not effective, therefore I lost effectiveness of my other pitches.

This definately can be seen in his first two starts, but looking at his full season there is less evidence that there was something different in his approach. The big numbers show a similar Matsuzaka in both season with a K/BB of 1.64 last year and a 1.80 in 2009. He was actually a bit better at avoiding walks, but a 4.55 BB/9 is still pretty bad. Let's look at his arm strength to see if there was any difference. His fastball dropped slightly from 91.8 to 91.0, but nothing to drastic and only his changeup also dropped more than 0.5 mph to match the fastball. Perhaps he was right that he was able to keep his speed up by relying on his shoulder strength, but we should be able to see some changes in his movement charts.