A method of performing an orthopedic procedure in a sacroiliac region. At least a portion of an undercutting system is inserted at least partially into an aperture in at least one of an ilium and a sacrum. The undercutting system includes an insertion apparatus, a probe assembly and a cutting assembly. The probe assembly is moved with respect to the insertion apparatus from a retracted position to an extended position so that at least a portion of the probe assembly is between the ilium and the sacrum. The probe assembly is manipulated between the ilium and the sacrum. The cutting assembly is moved with respect to the insertion apparatus from a refracted position to an extended position so that at least a portion of the probe assembly is between the ilium and the sacrum. The cutting assembly is manipulated between the ilium and the sacrum to cut tissue between the ilium and the sacrum.