The Dallas Cowboys placed linebacker Bruce Carter on injured reserve, ESPN Dallas reported Monday. Carter dislocated his left elbow during Thursday's game against the Washington Redskins. He will have surgery this week and miss the rest of the season. Dallas signed Brady Poppinga, who worked out for the team in late October. At the time, the Cowboys ended up signing Ernie Sims, who could start in place of Carter. Poppinga, who has been in the league for eight years, started 12 games for the St. Louis Rams last year. He played six years with the Green Bay Packers. The Cowboys are without two of their top tacklers, as linebacker Sean Lee was put on injured reserve a month ago with a toe injury. Carter is the fourth Cowboys defensive starter this year on injured reserve.