The Boston Bruins announced Wednesday that Charlie McAvoy underwent a procedure to deal with a shoulder injury.

USA defenseman Charlie McAvoy has been diagnosed with a "significant" right shoulder injury to his AC joint, sustained during the 4 Nations Face-off.

Charlie McAvoy will be out week-to-week after suffering an injury at the 4 Nations Face-Off -- and the Bruins are not happy.

Boston's star defenseman remains in the hospital and won't play in the 4 Nations Face-Off final vs. Team Canada.

Minas Panagiotakis/Getty Images Boston Bruins star Charlie McAvoy was hospitalized following Team USA's dramatic win over Canada in the 4 Nations Face-Off. "Charlie was admitted to Massachusetts General Hospital on Monday to undergo testing related to an upper-body injury sustained during the 4 Nations Face-Off and is currently being evaluated by Boston Bruins Head Team

USA and Canada are set to square off in the 4 Nations Face-Off finale on Thursday night, and if their initial matchup is anything to go off of, this should be a fantastic game. However, the Americans will be without one of their top defenseman, Charlie McAvoy, after he was hospitalized due to a shoulder infection.

Charlie McAvoy will not be in a Team USA uniform on Thursday ... that from the statement — losing a key player for the stretch run is the risk that all NHL teams take when sending players to this highly competitive midseason tournaments like the 4 ...

The Boston Bruins say defenseman Charlie McAvoy won’t be able to play for the United States in the championship game of the 4 Nations Face-Off on his home ice because of an undisclosed upper-body injury.

Charlie McAvoy was previously ruled out of the 4 Nations ... featuring the team’s logo and his number. It also had an NHL’s winter classic patch as well as an NTDP logo, and a special 'Kiley ...

BOSTON — Charlie McAvoy won’t have to watch the NHL 4 Nations Face-Off final on one of those little hospital TVs with the speaker on the same remote control that can call the nurse and adjust the bed.

Charlie McAvoy's condition is improving, but the Boston Bruins defenseman remains hospitalized and will not play for the United States in the 4 Nations Face-Off championship against Canada at TD ...

Charlie McAvoy is on the mend after suffering a shoulder injury during the NHL 4 Nations Face-Off that led to an infection that landed the Bruins defenseman in the hospital. The Bruins released a statement on his condition on Wednesday.