Madetzky was a silver medallist in the discus at the 1979 European Athletics Junior Championships, forming an East German 1–2 with Irina Meszynski. Her first an only major senior selection was for the 1982 European Athletics Championships, where she finished in fifth place with a throw of . This throw would have brought her at least the silver medal at all other previous editions of the championships, reflecting this sudden rise in standards. A member of the Chemie Halle sports club during her career, she twice reached the national podium, coming third at the East German Athletics Championships in 1985 and 1988.