The Detroit Lions desperation at running back has grown. After losing Ameer Abdullah for the forseeable future and an injury to Dwayne Washington, now running back Theo Riddick will miss time. Riddick has been ruled out for Sunday's game with an ankle injury, taking away one of Matthew Stafford's go-to weapons in the passing game. As a result of Riddick's absence, recently signed running back Justin Forsett figures to see significant work.