In 1990, Trenary won both the U.S. and World titles. Her strength in the compulsory figures was the deciding factor at the 1990 World Championships. She was 5th in the short program and second in the free skate to Midori Ito but her top placement in the figures kept her in the lead overall. The International Skating Union eliminated figures after that season. After she won her World title, her coach, Carlo Fassi, returned to live in his home country, Italy, and Trenary began working with Kathy Casey.