Running back Javon Ringer was placed on season-ending injured reserve by the Tennessee Titans with a torn ACL.
Chris Johnson's primary backup, Ringer dealt with an infection in his arm earlier this season before suffering the knee injury during a loss to the Minnesota Vikings. He finishes the 2012 season with just two carries for 14 yards. Ringer has 486 career rushing yards.
Jamie Harper will continue as Johnson's backup. Harper has 10 carries for 12 yards (1.2-yard average) this season.
Safety Tracy Wilson was promoted from the Titans' practice squad.