Tetiana Petlyuk of Ukraine lies on the track with a leg injury during her women's 800 metres heat at the IAAF World Championships in Daegu September 1, 2011. REUTERS/David Gray (SOUTH KOREA - Tags: SPORT ATHLETICS IMAGE OF THE DAY TOP PICTURE) 

Tetiana Petlyuk of Ukraine is taken from the track on a stretcher after injuring her leg during the women's 800 metres heat at the IAAF World Championships in Daegu September 1, 2011. REUTERS/David Gray (SOUTH KOREA - Tags: SPORT ATHLETICS)

Tetiana Petlyuk of Ukraine falls to the track with a leg injury during her women's 800 metres heat at the IAAF World Championships in Daegu September 1, 2011. REUTERS/David Gray (SOUTH KOREA - Tags: SPORT ATHLETICS IMAGE OF THE DAY TOP PICTURE)

Tetiana Petlyuk of Ukraine (L) pulls up with a leg injury during her women's 800 metres heat at the IAAF World Championships in Daegu September 1, 2011. REUTERS/David Gray (SOUTH KOREA - Tags: SPORT ATHLETICS)

Caster Semenya of South Africa (C) crosses the finish line in front of Tetiana Petlyuk of Ukraine (L) and Geena Gall of the U.S. in the women's 800 meters first heats during the world athletics championships at the Olympic stadium in Berlin, August 16, 2009. REUTERS/Michael Dalder (GERMANY SPORT ATHLETICS) 

Tetiana Petlyuk of the Ukraine poses with her silver medal during the award ceremony for the women's 800 metres at the 12th IAAF World Indoor Athletics Championship in Valencia March 9, 2008. REUTERS/Heino Kalis (SPAIN) 

Tetiana Petlyuk of the Ukraine, Australia's Tamsyn Lewis and Maria de Lurdes Mutola of Mozambique (L-R) pose with their medals during the award ceremony for the women's 800 metres at the 12th IAAF World Indoor Athletics Championship in Valencia March 9, 2008. Lewis won the gold medal, Petlyuk took silver and Mutola won bronze. REUTERS/Heino Kalis (SPAIN) 

Australia's Tamsyn Lewis (L) crosses the finish line ahead of Ukraine's Tetiana Petlyuk (R) and Mozambique's Maria de Lurdes Mutola (2nd L) in the women's 800m final at the 12th IAAF World Indoor Athletics Championship in Valencia March 9, 2008. REUTERS/Albert Gea (SPAIN) 

Ukraine's Tetiana Petlyuk (L) congratulates Australia's Tamsyn Lewis on her victory in the women's 800m final at the 12th IAAF World Indoor Athletics Championship in Valencia March 9, 2008. Petlyuk won silver in the event. REUTERS/Eric Gaillard (SPAIN) 

Athletes compete in the women's 800m final at the 12th IAAF World Indoor Athletics Championship in Valencia March 9, 2008. Pictured are in the front row (L-R) Mozambique's Maria de Lurdes Mutola, Australia's Tamsyn Lewis and Ukraine's Tetiana Petlyuk. REUTERS/Albert Gea (SPAIN) 

Athletes compete in the women's 800m final at the 12th IAAF World Indoor Athletics Championship in Valencia March 9, 2008. Pictured are (L-R): Mozambique's Maria de Lurdes Mutola, Australia's Tamsyn Lewis, Italy's Elisa Cusma Piccione and Ukraine's Tetiana Petlyuk. REUTERS/Albert Gea (SPAIN) 

Ukraine's Tetiana Petlyuk (front) and Britain's Jennifer Meadows (L) compete in the heats of the women's 800 metres at the 12th IAAF World Indoor Athletics Championship in Valencia March 7, 2008. REUTERS/Heino Kalis (SPAIN) 

Maria De Lurdes Mutola (R) of Mozambique wins the women's 800 metres race in front of Jennifer Meadows of Britain (2nd R), Elodie Guegan of France (2nd L) and Tetiana Petlyuk of Ukraine (L) during the Sparkassen Cup international indoor athletics meet in Stuttgart February 2, 2008. REUTERS/Michaela Rehle (GERMANY) 

Tetyana Petlyuk of Ukraine competes during the women's 800 metres heats at the 11th IAAF World Athletics Championship in Osaka August 25, 2007. REUTERS/Dylan Martinez (JAPAN)