The former model had signed up to begin filming The Games, which pits male and female celebrities against each other in a series of athletic events, early next year (06).
But doctors have told her she needs further corrective surgery on the severe injury she sustained in 1993 when she was hit by a police motorcycle while crossing a London street.
A show insider tells British newspaper The Sun, "She's really disappointed. She may only have one leg but she keeps in shape.
"She wanted to prove being disabled shouldn't hold anyone back."