I don't know if it is an "approved" method but I just cast on my # of stitches and then when I get ready to join the ends together I make sure that the stitches are not twisted. You also have to watch the first row because it can twist on you there too, so just take it slow. If it is a really big issue and you don't mind a seam you could also just knit it flat and then seam it together. There is a good video on this website that shows you, I think, what the stitches look like if they are twisted. I think it is either in advanced techniques or tips.