It isn't unexpected with Boulton not because he has been such an impact player this season, just that he really hasn't played at all. This is reminiscent of how Radek Martinek used to get injured.
Boulton has 0 points and just two penalty minutes in 4 games this season.
#Isles Injury Updates: Kyle Okposo (Jan. 19) and Eric Boulton (Jan. 17) have been retroactively placed on the team's IR list.
— New York Islanders (@NYIslanders) January 27, 2015