"I was never in a lot of pain," Gado said after the game. "But, as it progressed through the night, it just got worse, and my mobility is just pretty much down.
Gado is the sixth Packers running back to be felled by injury this season. Starter Ahman Green and top backup Najeh Davenport suffered season-ending injuries in October.
Gado, an undrafted free agent who had been signed to the practice squad in mid-October, was elevated to the lead role in early November. He responded with three 100-yard performances in five games before Monday.
Rodgers relieved Brett Favre late in the third quarter with the Ravens ahead 34-3. Rodgers, though, had a rough go of it.
He turned the ball over in three of his first four possessions, including two fumbles as he was hit in the pocket. The latter miscue resulted in a 35-yard touchdown return by linebacker Adalius Thomas to cap the scoring in the waning seconds.
Rodgers finished 8-of-15 throwing for 65 yards with a passer rating of 36.8.
"I would have liked to have been a little more productive out there," Rodgers said. "I feel like I made some good throws. But, at the same time, I made some mistakes out there. If you're making excuses, you could chalk it up to being a rookie. But, I don't accept excuses. I expect myself to be perfect when I'm out there."
It was only the second appearance of the season for Rodgers. He handled mop-up duty in the fourth quarter of the 52-3 rout of New Orleans on Oct. 9, completing his only pass for no gain.
In his second series Monday, Rodgers directed the offense to the Ravens' 6-yard line. However, a loss on a running play and a delay-of-game penalty moved the ball back to the 13 for third-and-goal. Rodgers subsequently forced a throw into triple coverage in the end zone, and safety Chad Williams intercepted it.
"He did some nice things, at times," coach Mike Sherman said. "Obviously, a couple of turnovers. He got hit from the blind side on two occasions, and that shouldn't have happened. But, it did."