Anyone can tell by looking at Kyle Middlebrooks' battered practice helmet that the guy has taken some hard knocks.
The Arizona State University senior running back sustained several serious injuries during his four-year college football career. Just months after recovering from surgery to repair a dislocated shoulder, Middlebrooks tore his anterior cruciate ligament in the final game of his sophomore season. And on top of that injury and its lengthy recovery time, he tore his right meniscus and chipped cartilage in his knee. It was a painful, months-long recovery process, he admits, and it kept him off the field for the entire 2013 season.
As a ball carrier, he's taken tackles that have dented his helmet and left him dizzy, confused, and even seeing colors that change right before his eyes.
But he's never been diagnosed with a concussion.