Wide receiver Calvin Johnson walked gingerly through the Lions' locker room Monday, like an old man. A teammate teased him, and he smiled. Johnson, the second overall pick in this year's draft, suffered a lower back injury when he fell making an impressive, leaping catch in Sunday's 56-21 loss at Philadelphia. But it's just a bad bruise. Nothing's broken. "Just came down wrong, I guess," Johnson said. "I smacked the dirt pretty hard. I felt it right away." Marinelli said Johnson was probably day-to-day