How far would you go to give your child a better life?

Six-year-old Isabella Lombardo has lived her short life debilitated by cerebral palsy.

It took almost two years for doctors to diagnose the neurological condition, which affects every part of her physical movement and leaves her in constant pain and unable to walk.

For Isabella's parents, Libby and Joseph, it's been a heartbreaking struggle. Naturally, they vowed to do anything and everything they could to help their precious daughter improve her life and gain the independence that we often take for granted.

But now, this determined family are faced with a difficult decision: should they put their faith – and their daughter’s life – in the hands of an unknown and untested treatment on the other side of the world to try to make that dream a reality?

This Sunday on 60 Minutes, reporter Liam Bartlett joins the Lombardo family in their search for a breakthrough in their daughter's struggle.

The catch? It’s a procedure doctors here are prohibited from performing.

"So you've got not one doctor here in Australia saying, 'I think this might be a good idea?'" Bartlett asks the parents.

Libby replied, "No, not one."

He tells Bartlett a lot more comprehensive, peer-reviewed medical trials are needed to prove that it works and that it is safe for the patient.

"It's potentially dangerous," Wolvetang says.

"There could be adverse effects, there could be clots, there could be immune reactions."

But despite the warnings, the Lombardos took a giant leap of faith, packing their bags and jumping on a plane to head into unknown, largely uncharted territory.

On 60 Minutes, Liam Bartlett is by Isabella's side as she goes into her stem cell surgery and is witness to the treatment’s first results.

Is the radical treatment too good to be true, or will Isabella finally walk on her own?

"The Big Step" airs this Sunday on Channel 9 following The Block. For more on 60 Minutes, head to the official website