The injury occurred in Maryland's 72-63 victory over No. 13 Iowa State on Tuesday. Wells had surgery Friday morning in Baltimore, the team announced.
Coach Mark Turgeon says, ''We will certainly miss our team leader. ... I am extremely disappointed for Dez.''
Wells is averaging a team-high 16.2 points per game and is a big reason behind the Terrapins' 5-0 start.
Maryland hosts Monmouth on Friday night.