US Patent 11707285 Undercutting system for use in conjunction with sacroiliac fusion

A method and apparatus for preparing a region between adjacent bones for fusion. A first aperture is formed that extends through one of the bones. An undercutting system is inserted into the first aperture. The undercutting system includes an insertion apparatus and a cutting assembly. A first path is cut between the adjacent bones by extending or retracting the cutting assembly with respect to the insertion apparatus.