The N.F.L. has often trumpeted its increased efforts to spot and treat concussions, including allowing a medical spotter to call a timeout this season if a potential injury is missed by on-field staff.
But the concussion sustained by St. Louis Rams quarterback Case Keenum on Sunday has fans wondering whether the league’s system is working as designed.
With just over a minute remaining in regulation time and the score tied, 13-13, against the Baltimore Ravens, Keenum dropped back to pass and was thrown to the ground after releasing the ball. The back of Keenum’s head slammed against the turf.