Backup offensive lineman Maurice Hurt missed Thursday’s offseason practice to have arthroscopic surgery on one of his knees, Redskins coach Mike Shanahan said.

Hurt missed last week’s round of offseason practices with a groin injury. Shanahan wasn’t sure on Thursday which knee the third-year pro had injured. He is expected to be healed in time for the start of training camp, the coach said.

Hurt, a seventh-round guard/tackle out of Florida in 2011, appeared in 13 games last season, starting one of them at right tackle. He started eight games at left guard in 2011.