Lance Berkman is dealing with a right knee injury that might eventually lead to his retirement. The Cardinals and Berkman have yet to offer specifics about an injury caused by him stretching for a routine throw from shortstop Rafael Furcal. Berkman felt continued stiffness in the leg Sunday afternoon and admitting contemplating the range of problems that Monday's MRI might find. "If I've re-torn my ACL or something like that, I'd certainly get it fixed but you don't know how psychologically you're going to come back from something like that," Berkman said. "I'm not talking from the standpoint of being scared of hurting it again. I'm talking about doing everything it takes to come back and play again at an elite level. I think that's a legitimate question I'm going to have to answer if, in fact, it turns out to be something more serious than we hope that it is. "I'll be glad to get some more definitive answers tomorrow. Then you map out your strategies and go from there."