Florey Institute researchers have questioned the benefits of a US treatment for stroke victims. Photo: Ellen Smith/AAP PHOTOS

A so-called miracle cure for stroke is no more effective than a placebo, a study has found.

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The treatment, known as perispinal etanercept, involves injecting an arthritis medication into the back of a patient's neck and tilting them downwards so it travels towards their brain.

Unavailable in Australia, stroke survivors have flown to the United States to receive the treatment, often at great expense.

But a trial conducted by scientists from The Florey has sh

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