It’s unclear when Crawford sustained the injury. He played all 60 minutes of Monday’s loss to the Los Angeles Kings, but sat out Wednesday’s game against the Philadelphia Flyers, giving backup Scott Darling the start.
Crawford has been having a career year, going 35-18-4 in 57 starts. He also has a personal-best seven shutouts this year to lead the NHL in that category.
To replace Crawford, the Blackhawks recalled Michael Leighton.
Leighton, 35, has been with Chicago's AHL affiliate Rockford all season and is 28-8-8 record in 46 starts. He is currently in third place in the AHL in saves and wins, and has a 2.44 goals against average and .918 save percentage this year.