49ers' Christian Ponder: Signs with 49ers

Ponder signed a one-year contract with the 49ers on Tuesday.

With Thaddeus Lewis (torn ACL) on injured reserve and Colin Kaepernick (shoulder) still not throwing, the 49ers need a third healthy quarterback for their upcoming joint-squad practices with the Broncos. If Kaepernick isn't available for Saturday's preseason game, Ponder may get thrown into the fire just four days after joining the team. Regardless, Ponder probably won't stick around beyond the preseason.