Saints sign Terrence Frederick from Browns practice squad _lowres

Photo credit: AP | Terrence Frederick runs a drill at the NFL scouting combine in Indianapolis. (Feb. 28, 2012)

The Saints placed hurt safety Kenny Vaccaro on season-ending injured reserve, and they signed cornerback Terrence Frederick from the Cleveland Browns' practice squad, coach Sean Payton said Wednesday.

Vaccaro, New Orleans' first-round pick this year, fractured his left ankle late in the first quarter of the Saints' 17-13 loss at Carolina this past Sunday. He was trying to help his teammates tackle Panthers' running back DeAngelo Williams after a handoff at Carolina's 27 when players fell on top of his left leg.

Athletic trainers put Vaccaro's leg in an air cast, and they carted him off. He was scheduled to have surgery on Tuesday. He finished his rookie campaign with an interception, a forced fumble and 79 tackles, which was third on the Saints (10-5) after Week 16.

Frederick, 23, entered the NFL as a 2012 seventh-round draft pick out of Texas A&M by the Pittsburgh Steelers, who waived him at the end of the preseason. He signed with the New York Giants' practice squad and got promoted to their active roster on Dec. 26, recording a pair of tackles in the last two games of the season.

The Giants waived the 5-foot-10, 187-pound Frederick this preseason, and he signed with Cleveland. At Texas A&M, he had 33 tackles, four picks, three pass break-ups and one forced fumble. He was described as a good zone defender coming out of college.

On Tuesday, Frederick logged onto his verified Twitter account and wrote, “Thankful for the opportunity ???? N.O. Saints.”