Canty suffered the injury last Friday in a practice drill and the fracture was surgically repaired Tuesday at The Hand Surgery Center by Dr. John Wagner.
"This is disappointing to both Dominique and the Shock because she worked so hard in the offseason, came into camp in such tremendous physical shape and was off to a great start," said Shock Coach Greg Williams. "We are hoping for a quick recovery and for her to miss a minimum amount of games."
Canty started 18 of Detroit's 32 games last season and averaged 6.2 points, 2.6 rebounds and 2.2 assists per contest in 19.5 minutes. She was second on the team with 45 offensive rebounds and 31 steals.
The 1999 WNBA Rookie of the Year runnerup, Canty has averaged 8.2 points, 2.7 rebounds and 2.2 assists in three WNBA seasons.
The Shock play their season opener at Orlando on May 30.