Sacroiliac joint stabilization and fixation devices and related methods

A method of using an anchor device to stabilize a sacroiliac joint (“SI joint”), comprising

• inserting a guidewire across an SI joint such that the guidewire extends through an ilium and at least partially into a sacrum;
• positioning an anchor device over the guidewire, where the anchor device includes:
• a housing defining a bore extending between a first end and a second end of the housing, wherein the housing comprises:
• an inner anchor defining the first end of the housing, wherein at least a portion of the inner anchor includes a threaded outer surface;
• an outer anchor defining the second end of the housing, wherein at least a portion of the outer anchor includes a threaded outer surface and the threaded surface of the inner anchor and the threaded surface of the outer anchor are timed such that each of the threaded surfaces form a single thread groove in a cortical wall of the ilium;
• and
• one or more apertures defined by at least one of the inner anchor and the outer anchor;
• one or more engagement members at least partially disposed in the housing, where at least one of the one or more engagement members is movable between a retracted position and an extended position such that, when the at least one of the one or more engagement members is in the extended position, the at least one of the one or more engagement members extends through at least one of the one or more apertures;
• wherein the anchor device comprises a continuous channel extending from a first end of the anchor device to a second end of the anchor device, the channel being configured to receive the guidewire;
• moving the anchor device across the SI joint such that the device extends through the ilium and at least partially into the sacrum whereby the threaded outer surface of the inner anchor contacts a cortical wall of the sacrum and the threaded outer surface of the outer anchor contacts a cortical wall of the ilium;
• mating an actuating screw with a threaded inner surface of the housing and moving the actuating screw in the channel bore of the housing toward the second end of the housing;
• longitudinally moving the at least one of the one or more engagement members toward the second end of the housing;
• rotating the at least one of the one or more engagement members from the retracted position to the extended position, to cause the at least one of the one or more engagement members to extend into cancellous bone of the sacrum;
• mating a compression screw with the threaded inner surface of the housing and moving the compression screw in the bore of the housing toward the second end of the housing;
• engaging the compression screw with a shoulder of the housing;
• rotating the compression screw relative to a longitudinal axis of the housing after the compression screw engages the shoulder of the housing;
• and
• urging, when the at least one of the one or more engagement members is in the extended position, the inner anchor towards the outer anchor to reduce a width of the SI joint;
• wherein moving the actuating screw toward the second end of the housing causes:
• the longitudinal movement of the at least one of the one or more engagement members toward the second end of the housing, and
• the rotation of the at least one of the one or more engagement members from the retracted position to the extended position;
• and
• wherein rotating the compression screw after the compression screw engages the shoulder of the housing causes the inner anchor to be urged towards the outer anchor to reduce the width of the SI joint.