Marathon world record holder Paula Radcliffe has revealed she has a low-grade stress fracture of her left femur but claims she is '90-100% likely' to compete in this summer's Beijing Olympics.

Radcliffe is currently on crutches to keep weight off the injury but is desperate to atone for the disappointment of failing to finish in the marathon four years ago in Athens when hampered by a leg injury and stomach upset.

But the 34-year-old, who since then has twice won the New York Marathon and the 2005 world title despite further injuries, is determined to compete in Beijing.

And Radcliffe, who last month had to pull out of chasing a fourth victory at the London Marathon with a toe injury, still believes she will race.

When asked how likely it was she would compete in China, she said: 'Ninety to 100%'.