"Right now, it feels great," Headley said. "I think anytime that you have a surgery, you will have some soreness, but for the most part, it feels great and much better than it has in a year at least."
A switch-hitter, Headley said he would occasionally feel soreness in the knee last season when he was hitting from the left side.
"But it wasn't like it was part of the problem," he said.
A year after leading the league in RBIs in 2012, Headley fractured the tip of his left thumb in March last year, causing him to miss the first 14 games of the season. He also dealt with a stiff back and the pain in his left knee that flared up on occasion.
Headley said he felt the worst in terms of his knee in September, which was actually his best month of the season, hitting .305 with five home runs and 14 RBIs.
"It was just a little cranky some days, and some days it didn't feel too bad. There wasn't one move that necessarily made it worse. It was a matter of dealing with it," he said.
Headley is prepared for days this spring and during the regular season where he'll encounter some level of stiffness in the knee, but he's been told that's perfectly normal after surgery.
"Most guys who have this surgery will tell you for a year, you'll have days where you're stiff and sore, but once you get up and get moving, it gets better," Headley said. "I really haven't had any issues. I was able to do everything I wanted to do in the offseason."
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.