First I've heard of the seriousness of Franklin's injury...
http://espn.go.com/blog/green-bay-pa...-valuable-time

Perhaps the biggest concern is about Franklin, the fourth-round pick from UCLA who finished his rookie season last year on injured reserve following a neck injury. The Packers are worried that Franklin's neck injury might be career-threatening. According to two people with knowledge of his situation, the Packers are putting Franklin through more tests to determine whether it's safe for him to continue playing.