NWSB Insider and Washington Huskies football writer Kris Shellenberger tells us what happened to beloved UW Huskies tailback in the 2012 NFL draft. He was not even drafted? How is this possible? Medical reports came out that Polk has arthritis in his shoulder that is only getting worse. He was signed as a UDFA to the Philadelphia Eagles and will provide a short yardage situation for the Eagles in 2012.