MacArthur was playing with an ongoing neck injury, Bruce Garrioch of Postmedia reports.
It is unclear if MacArthur's neck injury is related to the concussions that kept him out for all but the final four games of the regular season. The winger was crucial to the Senators postseason run as he racked up three goals and six helpers during the playoffs. General manager Pierre Dorion didn't seem overly consider about this ailment's long-term impact, so look for the 32-year-old to be ready for a full 82-game season next year.
MacArthur scored a second-period goal during Friday's Game 4 loss to Pittsburgh.
With Ottawa down 3-0, MacArthur scored an important goal to keep the Senators within striking distance in Game 4. The final score was 3-2, and the comeback fell short, but it wasn't a cakewalk for the Penguins. While this was just the third goal of the playoffs for MacArthur, he's registered six points and 13 shots through his past six games. The veteran winger is playing well for Ottawa and is worth considering in daily contests while moving the offensive needle.
MacArthur recorded two first-period assists during Tuesday's Game 6 win over the Rangers.
The veteran winger helped Ottawa grab a two-goal lead in the opening frame, and the Senators never looked back. MacArthur didn't make a significant impact on the series until the past two games, but his four assists in Games 5 and 6 were critical to eliminating the Rangers. After playing just eight regular season games over the past two seasons, MacArthur's return is a feel-good story, and his recent uptick in production has been a huge boost for Ottawa.
MacArthur set up two goals in Saturday's Game 5, 5-4 overtime win over the Rangers.
These were MacArthur's first points this series. He continues to be the story of the season after appearing in just four games in this season and four the previous one, all because of concussion symptoms.
MacArthur left Saturday's Game 2 with a pinched nerve in his shoulder, but will be in the lineup for Tuesday's Game 3 against the Rangers, Mike Morreale of NHL.com reports.
Fans of the game will be happy to hear the news, as there were fears that yet another concussion was what forced MacArthur out of Game 2. In eight postseason contests, MacArthur has tallied two goals and zero assists, but has the potential to break out offensively due to the sheer amount of power-play time that he receives (averaging 3:24 per game).