Different procedures. There a several different type of bunion procedures. Some may require screw fixation while others may not.
Surgery. A bunionectomy is a procedure to remove the bony "bump" from the inside of your big toe, at the level of the joint. There are many different types of bunionectomy, but the most common involve a small bone cut, sliding a portion of the bone back into place to straighten the foot, and using a small screw to hold it firmly while you heal.
Common. There have been several hundred different bunion procedures described in the literature. Some of the most common procedures involve screw fixation; however, the fact that a screw is used doesn't what procedure is actually being performed, although it does indicate that the bone is being broken in one or more places.
See below. This is where the bone in cut and re-positioned and then a screw is used to hold the bone in position. Read more...