Luck’s knee brace explained

Andrew Luck wears a brace on his left knee but hasn’t injured it. Mike Chappell got to the bottom of the mystery:

Former Stanford coach Jim Harbaugh had his quarterbacks play with a brace on their left knee. And that had nothing to do with whether the player had had knee issues in the past.

“Stability,’’ Luck said. “The theory behind it is that’s the lead leg as a quarterback when you’re throwing. You’re stepping and that’s sort of where bodies are flying in the pocket.’’