Kerryon Johnson‘s season is over. The Lions will place the standout running back on injured reserve with a knee injury, according to Ian Rapoport of NFL.com (on Twitter). 
The Lions are mathematically eliminated from the playoffs, so there’s little sense in pushing Johnson on to the field when he’s less than 100% anyway. The severity of Johnson’s injury is not yet known, but he is expected to make a full recovery in the offseason.
The rookie turned in a quality season, even as the Lions slumped. He finishes with 641 rushing yards on 118 attempts, which is good for a 5.4 yards per carry average. And, in Week 3, he snapped the Lions’ streak of 70 games without a 100-yard rusher.
The Lions will wrap their season against the Vikings and Packers. With Johnson out, they’ll continue to use LeGarrette Glount, Theo Riddick, and Zach Zenner in the backfield.
Great move. Save him for next year.