A method for fusing bones using a guide pin and a fastener is disclosed. The method includes inserting a guide pin into two bones. The guide pin including at least one radial marking. The method also including imaging the two bones and guide pin and analyzing the position of the at least one radial marking of the guide pin relative to the two bones. In addition, the method includes selecting a fastener, inserting a drill over the guide pin, drilling an opening through at least one of the two bones, and inserting the fastener into the opening. The guide pin may include an exterior surface with a first end and a second end, a cutting edge at the first end, and at least one radial marking near the first end. A system including a guide pin, a fastener, and a drill is also disclosed.