... off the practice field on Friday with a large ice pack applied to his back.  Since that time, Gaither has missed four team practices.  

The Ravens training staff initially diagnosed the injury as cramps. 

Gaither did run on a treadmill on Saturday, but did not practice with the team.

Coach John Harbaugh seemed exasperated by the injury.

"I'd like to be able to tell you what it is.  I don't know.  He's getting blood work, and they say they're going to do some tests on him on Monday, and they'll tell us what it is.  That's all they've told me."

As of now, the team does not know when Gaither will return.

Gaither had been the subject of trade rumors after being moved from left t...

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