Mark Prior

12/28/2007

Below are couple of video clips of Mark Prior pitching. These date back to 2002 when Mark Prior was still at USC.

Mark Prior's Pitching Mechanics

Mark Prior - Arm Action

Below are number of stills of Mark Prior. In them, you can clearly see the root cause of his injury problems. Also, at the bottom of this page are a number of frames taken from a clip of Mark Prior that I have analyzed and that clearly show his major Inverted W.

Mark Prior

Mark Prior

Mark Prior

Mark Prior

Mark Prior

Mark Prior

Mark Prior

Mark Prior

Mark Prior

Mark Prior

The images below are from a clip of Mark Prior pitching in 2002 while he was at USC. In these clips you can see the root cause of Mark Prior's injury problems. In general, his problem is a major Inverted W combined with significant Hyperabduction.

Mark Prior - Frame 23

Mark Prior - Frame 24

Mark Prior - Frame 25

Mark Prior - Frame 26

Mark Prior - Frame 27

Mark Prior - Frame 28

Note the pronounced Inverted W
in the photo above of Mark Prior.