Bears WR Johnny Knox was in good spirits Wednesday at p...

Bears WR Johnny Knox was in good spirits Wednesday at practice at Halas Hall but still a long way from participating in practice and an even longer way from playing in a game.

Still rehabilitating from surgery to stabilize a vertebra in his back after suffering a horrific injury Dec. 18 against the Seattle Seahawks, a clearly underweight Knox acknowledged the possibility that he might miss part or all of the 2012 season.

‘‘It could happen, but I’m staying optimistic,’’ said Knox. ‘‘My main focus is in the weight room. I’m not in a rush. This is my spine, the core of my body I’m dealing with. It’s not my knee, ankle or shoulder. I’m taking my time.’’

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