Denard Robinson sustained nerve damage in his right elbow due to an injury incurred in late October against Nebraska. The former starting quarterback will have trouble staying at quarterback in the NFL regardless of the injury, but the elbow problem doesn't help his case.
Also, according to MLive.com's Kyle Meinke, Robinson possibly increased his timetable for recovery by playing in the last three games of the season. However, he's finally been cleared for contact at the Senior Bowl.
Either way, any time you have nerve damage, it's a scary thing to deal with and a true concern. If Robinson is always fighting numbness in his hands or lack of motion in his elbow, he will have trouble playing any position on the offensive side of the ball.
That, or he'll have to go from right-hand dominant to left-hand dominant if he still isn't able to extend his fingers fully. Hopefully he gets full range and feeling back below his elbow, but the concern about his nerve damage will always be there.