Carlyle says it's a knee strain for Polak. About four weeks estimated.
Pro Hockey Talk "Calgary Flames forward Sven Baertschi isn’t the only early casualty in the 2014 World Championship. While Baertschi suffered a fractured rib, Carolina forward Andrei Loktionov and St. Louis defenseman Roman Polak are both out for the rest of the tournament with shoulder injuries, according to the..." May 10
St. Louis Post-Dispatch "The Blues announced Saturday morning that defenseman Roman Polak has been placed on injured-reserve with a lower-body injury and he will be re-evaluated in two weeks. Polak is believed to have suffered an ankle injury in a second-period spill in Thursday's 5-1 victory over Montreal. With..." December 21