Usually, but not always. First thing you need to try is 'bumping' the limb. String the bow and then twist the crooked limb in the opposite direction of the twist and see if you can't get the string to center up on the limb. If you can, leave it sit in the sun for a couple of hours to warm up, then lay it flat under a bed or something to let it cool overnight. Then draw it a few times and see if the string stays centered.

If that doesn't work, go to the tub and turn on the hot water. Run the limb back and forth under the water to warm it up and twist it opposite the twist again. It might take a few tries to get it right. That usually gets most of the twist out, if not all of it.

If it's still twisted, a bowyer might could fix it. No guarantee that he could though, and the fix would bring down the draw weight by several pounds. Really, if the first two methods don't get it done, then the limb is probably a goner.