NEW YORK (AP) _ New York Rangers goalie Mike Richter underwent successful surgery Wednesday to repair a torn ligament in his left knee.

Richter, injured during the NHL's All-Star skills competition in February, had a 90-minute procedure in which there were no complications.

``The procedure performed on Mike this morning went extremely well,'' said Dr. Barton Nisonson, who performed the surgery with Dr. Tony Maddalo at Lennox Hill Hospital. ``Following the operation, the knee was very secure and stable.''

The 33-year-old veteran of 12 seasons will be on a rehabilitation program expected to take six months. Richter will miss training camp in September and is questionable for the start of next season.

``After the necessary rehabilitation, we are extremely optimistic that Mike will return to full form,'' Dr. Nisonson said.

Richter, who played the day after the injury in the final period of the All-Star game, was 4-12-1 in 17 starts since being hurt and also sat out seven games.

His play slipped, as did that of the Rangers, who will miss the playoffs for the third straight season. Richter elected to have the operation now after the extent of the injury was diagnosed last week.

Richter finished the season 22-31-8 with a 2.87 goals-against average.

Jean-Francois Labbe made his NHL debut in goal for the Rangers at home Wednesday night against the Montreal Canadiens.