Andy Pettitte’s lost season came to an end yesterday when the Houston Astros announced the pitcher would have surgery on his troublesome left elbow next week.

“It was getting to the point where the guys were focused on whether I could make it through the inning, much less get through the year,” Pettitte said. “I’m in unfamiliar territory. This is extremely disappointing.”

Dr. James Andrews will perform the surgery next Tuesday to repair a torn flexor tendon.

Pettitte, 32, will start rehabilitation the day after surgery and be in a brace for up to six weeks. He will resume throwing 12-to-16 weeks after the procedure.

On Tuesday, the Astros pushed Pettitte’s start back two days until Saturday. But the former All-Star realized his elbow wasn’t right in his bullpen session on Monday.

“At that point, the reality set in that I had pushed it as far as I was going to be able to push it,” Pettitte said. “I think throughout all of this that I was pretty much the only one who was not facing up to the reality that I might not make it through the season.”

A two-time 21-game winner, Pettitte joined the Astros in December, leaving the Yankees as a free agent to sign a $31.5 million, three-year contract.

But Pettitte tore a tendon in his elbow in his Houston debut – while batting, of all things – and has not been right all season.

Pettitte was 6-4 with a 3.90 ERA in 15 starts for the Astros, who have had a disappointing season after coming in with high expectations.