Jets running back Curtis Martin strained his right knee against the Miami Dolphins on Sunday and his status is uncertain for this week's game against Jacksonville. Coach Herman Edwards said Monday that Martin was undergoing an MRI and would wait for the results before determining whether the running back can play. Martin, who led the NFL in rushing last season, was injured in the first quarter but stayed in the game and finished with 72 yards on 31 carries in the Jets' 17-7 victory. "We don't know where he's at," Edwards said. "He's been a guy that's always answered the bell. We'll see where he's at."