|1995 Gothenburg||4 x 100 m|
|1994 Helsinki||4 x 100 m|
|Representing West Germany|
|1990 Split||4 x 100 m|
Her greatest successes were the bronze medal in the 4 × 100 metres relay race at the 1995 World Championships (together with Melanie Paschke, Silke Lichtenhagen and Gabriele Becker) and the gold medal at the 1994 European Championships in the same event (together with Melanie Paschke, Bettina Zipp and Silke Lichtenhagen). She placed fourth in the individual 200 metre sprint.
Knoll was a member of the German national team at many important international meetings until 1996. She entered the 200 metre sprint at the 1988 Olympic Games in Seoul but was eliminated in the semi-final. She won the silver medal at the 1990 European Championships in the 4 × 100 m relay. She came fifth in the 200 metre sprint. At the 1992 Olympic Games she came fourth in the 4 × 100 m relay and reached the semi-final in the 200 metre sprint. Her third entry at the Olympic Games in 1996 was ill-fated; the 4 × 100 m relay team did not manage to carry the baton to the finish line.
Knoll may not have been in the limelight as much as some other athletes, but few can match her 22 German championship titles. She competed for the MTV Celle, from 1987 to 1989 for SC Eintracht Hamm, then for LG Olympia Dortmund. While she was still competing, she was 1.63 metres tall and weighed 52 kilograms. She ended her athletics career in 1997.