David Ortiz has been playing with a torn meniscus in his right knee since the middle of the 2006 season, the Red Sox slugger revealed Thursday night. Speaking to reporters after Boston returned from the All-Star break to beat Toronto 7-4, Ortiz said he hurt his knee during batting practice at Yankee Stadium last summer. Ortiz said when he twisted his leg to field a bunt, his knee turned but his spike got caught in the netting that protects the grass in front of home plate. Ortiz said he hasn't needed surgery because the knee is free of inflammation.