Canucks' defenseman Mattias Ohlund has bone chips in his left knee, and he could require arthroscopic surgery if swelling doesn't subside, according to the Vancouver Sun. "I missed 16 games leading into the playoffs the year we played St. Louis and finally lost against Minnesota, and this is a similar thing," Ohlund said on Thursday night. "So I scoped it then and missed a few weeks and came back."