St. Louis Rams left tackle Jake Long exited Thursday evening's Week 4 showdown with the San Francisco 49ers with a knee injury.
Ben Volin of the Boston Globe pointed out how Long has had knee injuries in the past, which makes this latest potential setback concerning:
Uh oh, Jake Long down on the play. Got rolled up on his knee. Third or fourth time in his career now. Ouch— Ben Volin (@BenVolin) September 27, 2013