Luol Deng has a torn ligament in his left wrist. The surgery would sideline him for three to four months and likely cost him the entire season and playoffs.
He's decided to play through the pain. He can't damage the ligament more since it is already torn. I'd imagine he'll need to have surgery after the season is over.
Fortunately for the Bulls, the injury is on his left, non shooting, wrist. That doesn't make the injury insignificant though. While his shooting stroke shouldn't lose too much, he'll still need to finish with his left, dribble, and physically check guys on defense.
Hopefully the pain threshold isn't too great, and he's able to continue to play through. Even in Deng's darkest days as a Bull when he was viewed as a bad contract, I always admired him as a person. This is just one more example of him putting the team before himself.