Matt Barkley has Grade 3 shoulder separation
http://www.rotoworld.com/player/nfl/7421/matt-barkley
The shoulder injury that will prevent USC QB Matt Barkley from throwing at this week's NFL Combine is a Grade 3 separation.
The separation is in Barkley's throwing arm, so it's understandable that he doesn't want to test it out until it's back in peak condition. A source told PFT that Barkley remains confident he'll display a "bigger and a stronger arm than anyone can imagine" at his late-March Pro Day. If Barkley performs well on March 27, his stock could