Just to provide some closure on the matter, we go to William Ladson:
#Nats OF Josh Willingham had surgery on his left knee today. He is out for the season.
William Ladson
washingnats
There was no point in Willingham trying to play through pain the rest of the way, given the irrelevance of the Nationals' schedule and the difficulty he was having at the plate. It's a matter of being healthy in time for 2011, which shouldn't be a problem.