There's at least one gruesome injury a week in the NFL, but they're usually of the ankle, knee, or elbow variety. This one's a bit different, and really pretty horrible to watch.

Chicago's Johnny Knox had injury added to insult when, after fumbling, he's bent over backward to the point of his helmet nearly touching his heels. He was taken off-field on a stretcher, and Bears sideline reporter Zach Zaidman reports Knox has movement in both his hands and his legs. [Chicago Tribune/FOX/NFL RedZone]