Chris Johnson's knee, FA prospects

It has been a long time since Chris Johnson came anywhere close to living up to the CJ2K moniker he earned back in 2009. Still, he has topped the 1,000-yard rushing mark every season of his NFL career, including 2013, when he had 1,077 yards on the ground. A large reason for his ability to rack up quality totals each year is he has proved quite durable, never missing a game due to injury in six seasons. To that point, it turns out that he battled through a knee injury for most of the 2013 campaign.