Ryan Torain is essentially finished with the Broncos after he was placed on the waived injured list Wednesday.
Injuries continued to haunt Torain after he was diagnosed Wednesday with a strained left knee ligament.
Torain had missed most of his rookie year in 2008 with a dislocated elbow and a torn anterior cruciate ligament in his left knee.
To replace Torain, the Broncos signed former University of Texas-El Paso running back Marcus Thomas, who was at practice Wednesday. The tailback Thomas was a fifth-round draft pick of the San Diego Chargers last year.