History lesson: QBs coming back from knee injuries

Tom Brady is not the only NFL quarterback to come back from a serious knee injury. Fellow NFL signal callers Donovan McNabb, Carson Palmer, and Daunte Culpepper all missed time in the last few years recovering from torn ACLs in their knees. Below is quick look at how these quarterbacks performed both immediately before and after their injuries.

Gregory Lee, Aaron Atencio / Globe Staff