Martin Erat left Game 4 against the New York Rangers on Wednesday with 1:34 remaining in the opening period and appeared to be favoring his arm following a hard collision involving Rangers center Derek Stepan and Capitals wing Alex Ovechkin.
After the game, Washington coach Adam Oates said Erat was dealing with an upper-body injury and would be re-evaluated Thursday.
Crabb, 30, collected two goals and eight penalty minutes in 26 games with Washington this season and six goals and six assists in 12 games with Hershey. He led the Bears with five goals in five games during the Calder Cup Playoffs.
Wilson, 19, was a first-round pick in the 2012 NHL Draft who recently made his professional debut with Hershey in Game 3 of the AHL Eastern Conference quarterfinal vs. Providence and recorded one goal and six penalty minutes in three playoff games with the Bears.
During his season with Plymouth of the OHL, he had 23 goals, 58 points and 104 penalty minutes in 48 games. The 6-foot-4, 210-pound forward took part in Capitals training camp in January.