The Stars Saturday placed Sydor on injured list, retroactive to March 8. He is eligible to return Tuesday when the Stars visit Pittsburgh, but is expected to miss about a week.
Sydor aggravated the injury last Sunday against St. Louis when he was checked along the boards.
Once a strong Norris Trophy candidate, Sydor originally suffered the injury in the first period of a 1-1 tie with Colorado on Feb. 21. Moments after assisting on Dallas' goal, he was hip-checked by Stephane Yelle at the attacking blue line.
Sydor has a career-high 12 goals and still is only seven points off the pace for the scoring lead among defensemen with 41. Before the original injury, he led all NHL defensemen in points and assists on the power play.
An offensive defenseman who can also play on the forward line, Sydor is one of only two regulars on the league-leading Stars to have a minus rating (minus-2). He is second on the team in assists and power-play goals (seven).
Sydor was a restricted free agent before re-signing a four-year deal before the season, his first as an All-Star.
The 26-year-old recorded 11 goals and a career-best 35 assists in 79 games last season. He ranked second on the team in power-play points (28), third in assists and fourth with a plus-17 rating.
Sydor was a 1990 first-round pick of the Los Angeles Kings and played with them from 1991 until being dealt to Dallas in February 1996. In 534 NHL games, he has 53 goals, 195 assists and 419 penalty minutes.
The Stars, who have allowed an NHL-low 129 goals, lead the league with 94 points, 10 better than Eastern Conference-leading Ottawa. They begin a three-game East Coast road trip Sunday in Philadelphia.
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