A lateral-posterior approach sacroiliac joint stabilizing method including, as viewed from a lateral view of a pelvic region of a prone patient, forming a first incision that is anterior to a posterior sacral wall and inferior to an ala and a second incision that is located along a lateral border of the sacroiliac joint, and thereafter, forming a first void that extends from the first incision, through the ilium, across the sacroiliac joint and into the sacrum and a second void that extends between the second incision and into the sacroiliac joint. A first implant is placed within the first void such that the first implant extends across the sacroiliac joint with its distal end within the sacrum and its proximal end flush with the lateral aspect of the ilium, and a second implant is placed within the second void such that the second implant extends into the sacroiliac joint.