– Thursday, Mark Teixeira said that his leg "doesn't really work right now." Friday, he found out why: It is broken.

The New York Yankees All-Star first baseman will miss the remainder of the season after the latest series of tests on his right leg on Friday revealed a fracture that had gone undetected by previous CT scans and magnetic resonance imaging exams.

"It's been painful since Day 1," Teixeira said. "So we were just trying to figure out why it wasn't healing, and today we figured it out."

Teixeira fouled a pitch off his shin on Aug. 17. He played in two more games, but the leg never properly healed. Even as of Thursday, Teixeira maintained that he expected to be back before the end of the season. But the tests Friday proved otherwise.

"Today's test was more to see how much healing took place, and I think Tex was expecting good news," General Manager Brian Cashman said. "Instead it was quite the opposite, it was bad news."

Teixeira will be on crutches for a month, and Cashman said the injury requires a three-month recovery period.

Added Teixeira: "Fortunately or unfortunately, I have a high tolerance for pain. I've played through broken toes. I've played through a lot of major injuries. When I pick up a bat or I go out and try to run, I kind of say, 'All right, well, I think I can go' or, 'Hey, it doesn't feel quite right.' There's kind of that gray area always with athletes. If I'm screaming in pain all day long, they probably say, 'This isn't right, let's shut him down.' But I was trying to play. I was trying to play every single day."

Teixeira is hitting .255 with 31 home runs and 79 RBI. Rookie Greg Bird has filled in admirably, but Teixeira's production will be difficult to replace.

"I can't put it into words," Teixeira said. "I feel like this team has a chance to go to the World Series, and to not be on the field is really tough to take."