Sister Bernadette Moriau from northern France visited the holy spring in the foothills of the Pyrenees mountains in July 2008, aged 69, seeking a cure to her ailment like millions of other pilgrims each year.
Shortly after returning home, her chronic sciatica or pinched spinal nerve disappeared for the first time since she was first diagnosed at the age of 27.
Sister Bernadette had undergone four unsuccessful operations.
After further examinations by doctors and three meetings of church figures in Lourdes, the medical committee in the town confirmed that Moriau's recovery could not be explained scientifically, the statement said.
Lourdes is one of the most revered sites for the world's 1.2 billion Catholics because the town is said to be where the Virgin Mary appeared to a peasant girl in a grotto.
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