Red Sox second baseman Dustin Pedroia is scheduled to return to Boston Thursday morning for an examination of his right knee, which evidently has been bothering him for the last three weeks. The Boston Globe reported on its website Wednesday night that Pedroia could require surgery that would sideline him a month. Asked about that possibility, Pedroia replied in a text message: "I'm not having surgery. I'm going to get it checked.'' A team source refuted the assertion that Pedroia needs surgery. "He's getting it checked, that's all,'' the source said.