The Panthers have placed 28-year old linebacker Landon Johnson on the Injured Reserve List with a severe knee sprain.  Johnson played in 10 games for the Panthers this season and he had 20 tackles including 1 tackle for a loss.  In his two years with the Panthers, Johnson has played in 25 games in which he has 36 tackles and 2 forced fumbles.  This injury really hurts the Panthers who are already without Thomas Davis for the year.