I swapped from regular running shoes to barefoot shoes (five fingers) to train for this year's London marathon. I had a sore knee. (ITB) I still have a sore knee, but it's no worse or better with the barefoot shoes. I had high hopes that it would kick my injury, like it did to everyone in the book (Born to Run) Sadly not. But I still love my new shoes. Funky with a capital F!