At practice Monday MacArthur was on a line with center Derick Brassard and right wing Bobby Ryan.
"It was basically like having a pinched nerve," MacArthur said. "I had work on it the past two days and feel 100 percent; it's not an issue at all. We tried to work on it during Game 2] but my whole left side was numb and it was tough skating out there on one shoe. [Jean-Gabriel] Pageau was taking over anyway."
Pageau scored his fourth goal of the game 2:54 into double-overtime to give Ottawa a 6-5 win.
Defenseman Erik Karlsson was absent from practice Monday but will play Tuesday.
"It was a maintenance day; it's the end of the season and we've been skating a lot here," Karlsson said. "It's rare to get two days of rest so I decided to take advantage of it.
"You're always in discomfort this time of the year. Your body is going through a lot. But again, it's not something that's uncommon or something you can't deal with. It's not going to be an issue moving forward."
Karlsson played 37:32 in Game 2 and has averaged an NHL-high 31:06 of ice time through eight Stanley Cup Playoff games.
[[RELATED: Complete Senators-Rangers series coverage]
Boucher tried different line combinations at practice. Kyle Turris centered Viktor Stalberg and Mark Stone on the top line; Turris was with Ryan Dzingel and Alexandre Burrows at the start of Game 2. Burrows took Stone's spot on a line with center Jean-Gabriel Pageau and left wing Mike Hoffman. Dzingel went into Stalberg's spot after left wing with center Zack Smith and right wing Tommy Wingels.
Forward Tom Pyatt (upper body) and defenseman Chris Wideman, who hasn't played since Game 5 of the first round April 21, are available according to Boucher, who said he is anticipating a raucous environment for Game 3. Ottawa won three games on the road against Boston and 11 of their past 16 (11-3-2) at Madison Square Garden.
"We're expecting the best we've seen from the Rangers in the playoffs on Tuesday, more than we have from any other team," Boucher said. "We're expecting the fans to be wild and expecting their A-plus effort. If the last game showed anything, it's that if we don't respect their game it's going to be difficult."
Although the Senators rallied to win Saturday, Boucher saw some flaws. He referred specifically to the second period, when the Rangers scored three goals on 19 shots to take a 4-2 lead.
"We need to improve our mindset," Boucher said. "While we want to attack, we can't attack with four guys hoping that [puck] goes in and forget the rest. It wasn't a respectful approach towards such a great opponent. The Rangers have great speed, depth and are really well coached."
