BOSTON - The Boston Celtics announced today that guard Tony Allen had successful anterior cruciate ligament reconstructive surgery along with cartilage repair to his left knee. The surgery was performed this morning at New England Baptist Hospital by Celtics Team Physician, Dr. Brian McKeon and assisted by Dr. Paul Weitzel. Allen is out indefinitely with no timetable set for his return. Allen appeared in 33 games this season, averaging 11.5 points, 3.8 rebounds and 1.48 steals in 24.4 minutes per game. The 6'4" guard had set or tied career-highs in 12 statistical categories this season.