The meeting ended with a score of 4:1.
As part of the Avalanche, goals were scored by Mikko Rantanen (17th minute), Bowen Byram (28th, 50th) and Valery Nichushkin (43rd).
The Blues scored Samuel Blaze (36th).
The Russian striker left the ice in the second period.
Blues head coach Craig Berubi said Buchnevich will miss at least one game.
Earlier it was reported that Malkin's double did not save Pittsburgh from defeat in the match with New Jersey.