Three head injuries in four weeks highlight D.C. United’s dark history with concussions
(Washington Post DC United)

With D.C. United‘s match almost over and the ball at the other end of the field, captain Steve Birnbaum rested on one knee and signaled to the bench. For the second time in the late stages of Saturday’s game in the Denver suburbs, the fundamental task of heading a soccer ball had left him dizzy. […]