Pittsburgh, PA (SportsNetwork.com) - The Pittsburgh Steelers bolstered their shaky offensive line on Wednesday, acquiring former fifth-overall pick Levi Brown from the Arizona Cardinals in exchange for a conditional draft pick.

Brown was taken by Arizona in the first round of the 2007 draft and started 75 games over his first five seasons, but missed the entire 2012 campaign with a torn triceps before starting the Cardinals' first four games this season.

The Steelers, off to their first 0-4 start since 1968, have allowed 15 sacks already this season.

To make room for Brown on the roster, Pittsburgh released cornerback Isaiah Green.