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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.

Mark
Prior - Frame 29 
Mark
Prior - Frame 30 
Mark
Prior - Frame 31
Mark
Prior - Frame 32 |