Knight underwent the procedure in Philadelphia and the club said he is already rehabilitating the injury when it announced the update on Friday.
Knight suffered the injury in late January and missed the next seven weeks. He returned to play in 10 games before being shut down for the season.
Knight averaged a career-best 19.6 points in 52 games this season. He also averaged 5.1 assists, 3.9 rebounds and 1.2 steals.