Posterior stabilization systems and methods
An implantable body for a posterior stabilization system includes a lateral end, a medial end, an inwardly facing surface configured to abut against a lamina when the body is implanted along a vertebra. A lateral bone outrigger extends from the inwardly facing surface and may include a bone-abutting surface along a medial portion disposed to abut against a lateral mass of the vertebra when the body is implanted along a vertebra. The lateral bone outrigger may have a first height. A penetrating feature extends from the inwardly facing surface between the bone-engaging portion of the inwardly facing surface and the lateral bone outrigger. The penetrating feature may have a second height less than the first height. A fastener bore extends through the body at an angle toward the lateral bone outrigger.
1. An implantable body for a posterior stabilization system comprising:
a lateral end, a medial end, an inwardly facing surface, and an outwardly facing surface, the inwardly facing surface having a bone-abutting portion disposed proximate the medial end and configured to abut against a lamina when the body is implanted along a vertebra;
a lateral bone outrigger extending from the inwardly facing surface adjacent the lateral end, the lateral bone outrigger having a bone-abutting surface along a medial portion disposed to abut against a lateral mass of the vertebra when the body is implanted along a vertebra, the lateral bone outrigger having a first height;
a penetrating feature extending from the inwardly facing surface between the bone-engaging portion of the inwardly facing surface and the lateral bone outrigger, the penetrating feature having a second height less than the first height; and
a fastener bore extending through the body from the inwardly facing surface to the outwardly facing surface, the fastener bore being angled toward the lateral bone outrigger.
2. The implantable body of claim 1 , wherein the inwardly facing surface comprises a tapered surface and a flat surface, the bone-abutting portion being formed of the tapered surface.
3. The implantable body of claim 1 , wherein the inwardly facing surface comprises a curved surface and a flat surface, the bone-abutting portion being formed of the curved surface.
4. The implantable body of claim 1 , wherein the bone-abutting surface on the lateral bone outrigger is a rounded surface.
5. The implantable body of claim 1 , wherein the fastener bore is angled at an angle within the range of about 20-55 degrees when measured in cross-section.
6. The implantable body of claim 5 , wherein the fastener bore is angled at an angle within the range of about 20-55 degrees as measured from a side edge.
7. The implantable body of claim 6 , wherein the second height from the inwardly facing surface is within a range of about 4-8 mm.
8. The implantable body of claim 6 , wherein the lateral bone outrigger is cylindrically shaped and is disposed proximate only a portion of the lateral end.
9. The implantable body of claim 6 , wherein the lateral bone outrigger is disposed in a corner of the inwardly facing surface.
10. The implantable body of claim 6 , wherein the lateral bone outrigger is disposed along a centerline extending from the medial end to the lateral end.
11. The implantable body of claim 1 , wherein the fastener bore is angled so that when the implantable is implanted, the fastener bore forms an angle in the range of 20-55 degrees from the sagittal plane and an angle in the range of 20-55 degrees from the axial plane.
12. A posterior stabilization system comprising:
an implantable body shaped to abut against a lateral mass of a cervical vertebra comprising:
a lateral end, a medial end, an inwardly facing surface and an outwardly facing surface, the inwardly facing surface having a bone-abutting portion disposed proximate the medial end configured to abut against a lamina when the body is implanted along a vertebra;
a lateral bone outrigger extending from the inwardly facing surface adjacent the lateral end, the lateral bone outrigger having a bone-abutting surface along a medial portion disposed to abut against a lateral mass of the vertebra when the body is implanted along a vertebra;
a penetrating feature extending from the inwardly facing surface between the bone-engaging portion of the inwardly facing surface and the lateral bone outrigger; and
a fastener bore extending through the body from the inwardly facing surface to the outwardly facing surface;
a rod receiving portion sized to receive a fixation rod, the rod receiving portion being pivotably attached to the body; and
a fastener sized to extend through the bore and penetrate the lateral mass of the vertebra.
13. The system of claim 12 , wherein the inwardly facing surface comprises a curved surface and a flat surface, the bone-abutting portion being formed of the curved surface.
14. The system of claim 12 , wherein the bone-abutting surface on the lateral bone outrigger is a rounded surface.
15. The system of claim 12 , wherein the fastener bore is angled at an angle within the range of about 20-55 degrees when measured in cross-section.
16. The system of claim 12 , wherein the fastener bore is angled at an angle within the range of about 20-55 degrees as measured from a side edge.
17. A non-pedicle based fixation system, comprising
a first posterior stabilization system comprising:
a first body shaped to abut against a lateral mass of a first cervical vertebra, the first body comprising:
a lateral end, a medial end, an inwardly facing surface, and an outwardly facing surface, the inwardly facing surface having a bone-abutting portion disposed proximate the medial end and configured to abut against a lamina when the body is implanted along a vertebra;
a lateral bone outrigger extending from the inwardly facing surface adjacent the lateral end, the lateral bone outrigger having a bone-abutting surface at along a medial portion disposed to abut against a lateral mass of the vertebra when the body is implanted along a vertebra, the lateral bone outrigger having a first height; and
a penetrating feature extending from the inwardly facing surface between the bone-engaging portion of the inwardly facing surface and the lateral bone outrigger, the penetrating feature having a second height less than the first height; and
a first rod receiving portion shaped to receive a fixation rod, the rod receiving portion being disposed closer to the lateral end than the medial end;
a second posterior stabilization system comprising
a second body shaped to abut against a lateral mass of a second cervical vertebra, the first body comprising
a lateral end, a medial end, an inwardly facing surface, and an outwardly facing surface, the inwardly facing surface having a bone-abutting portion disposed proximate the medial end and configured to abut against a lamina when the body is implanted along a vertebra;
a lateral bone outrigger extending from the inwardly facing surface adjacent the lateral end, the lateral bone outrigger having a bone-abutting surface at along a medial portion disposed to abut against a lateral mass of the vertebra when the body is implanted along a vertebra, the lateral bone outrigger having a first height;
a penetrating feature extending from the inwardly facing surface between the bone-engaging portion of the inwardly facing surface and the lateral bone outrigger, the penetrating feature having a second height less than the first height; and
a second rod receiving portion shaped to receive the fixation rod, the rod receiving portion being disposed closer to the lateral end than the medial end; and
a fixation rod disposed within the first and second rod receiving portions.
18. The system of claim 17 , wherein the first body comprises a fastener bore extending through the body from the inwardly facing surface to the outwardly facing surface, the fastener bore being angled toward the lateral bone outrigger.
19. The system of claim 18 , wherein the first body includes a side edge, the fastener bore being angled away from the side edge.
20. The system of claim 19 , wherein the fastener bore is angled toward the lateral bone outrigger within an angle range of about 20-55 degrees, and the fastener bore angled away from the side edge within an angle range of about 20-55 degrees.