Smith left Tuesday's game in the second quarter. He was scheduled to have arthroscopic surgery later Wednesday.
The 6-foot-6 Smith is third on the team in scoring at 15.4 points per game. He leads the team in 3-pointers with 114.
Smith missed 10 games earlier in the season when he was suspended by the league for his role in a brawl with the New York Knicks on Dec. 16.