Chris Young:  Oblique injury (left)

There are two groups of oblique muscles in the body.  The first group is the superior and inferior oblique muscles.  These are in the eye and we won't concern ourselves with those ones unless Chris Young complains of double vision.  The oblique muscles that we care about, that our OG pitcher Chris Young has problems with, are the external and internal oblique muscles on the left side.  There are seven layers of the abdominal wall and two of them are our new friends the obliques.  (Say hi.)  They basically hang out on the sides of your body at the level of the abdomen and my guess is that the problem is with the internal oblique because it ding, ding, ding compresses and supports part of your abdomen (the viscera) as well as flexing and rotating that part of your body.   Why does this matter? When our boy C-Y pitches the sequence includes the following motions: stride, pelvis rotation, upper torso rotation, elbow extension, shoulder internal rotation and wrist flexion.  
    Right where it says pelvis rotation and upper torso rotation is where we'll find the problem.  

It was a left oblique injury and as a right hander your strained oblique would be facing the batter.  Therefore, and C-Y is coming set to pitch, his arm/shoulder is hunky dory but the movement of the body (the twist, if you will) below the arm and is the set-up for all the force that will come through in the baseball is conspicuously absent.  Also, I've been told it hurts like a bitch.

Update:  Padres.com reports that Chris Young will be back on August 9 to start against St. Louis...with a vengeance.

Disclaimer:  I have not taken a full history on Mr. Young so these are simply my thoughts and conjecture about his injury.  

Special thanks to Fleisig et al