Sacroiliac joint fixation
Bone anchor implants, assemblies, systems, instruments, and methods thereof. The bone anchors may be threaded or non-threaded, adjustable or expandable, stackable, or otherwise configured to promote fixation of the sacroiliac joint. The bone anchors may be used independently or may be configured to integrate with long rod constructs, for example, with a tulip or other suitable attachment interface, to fuse the sacroiliac joint.
1 . A sacroiliac joint fixation implant comprising:
an outer sleeve and an inner sleeve extending along a central longitudinal axis, the outer sleeve defining a central channel for receiving the inner sleeve, the inner sleeve defines an opening configured for receiving a spinal rod, and the inner sleeve includes an inner tapered section around the opening;
a clamp receivable through the inner sleeve, the clamp having a clasp configured for receiving the spinal rod; and
a tightening bolt coupled to the clamp, wherein as the tightening bolt is rotated, the clamp is drawn back proximally into the tightening bolt, and the clasp is retracted into the inner tapered section, thereby locking the spinal rod to the implant,
wherein the tightening bolt is partially cannulated with a blind hole and a proximal end of the clamp is received therein.
2 . The implant of claim 1 , wherein the outer and inner sleeves telescope with respect to one another to adjust an overall length of the implant.
3 . The implant of claim 1 , wherein the outer and inner sleeves have polygonal bodies.
4 . The implant of claim 1 , wherein a proximal end of the outer sleeve includes an enlarged lip configured to abut an ilium of a patient.
5 . The implant of claim 1 , wherein the clamp has an elongate body with the clasp at a distal end, the clasp includes a C-shaped body defining a circular opening configured to surround the spinal rod.
6 . The implant of claim 1 , wherein the tightening bolt includes an enlarged head configured to abut a proximal end of the outer sleeve.
7 . The implant of claim 1 , wherein a distal end of the tightening bolt is threadedly engaged with a proximal end of the clamp.
8 . The implant of claim 1 , where the inner tapered section is widest at a distal end of the inner sleeve and internally narrows proximally.