Bunion correction system and method
A minimally invasive method of correcting a bunion includes performing an osteotomy to divide the metatarsal into first and second portions, creating a pocket in the first portion implanting a nail in the pocket, securing a suture to the joint capsule, tensioning the suture to align the great toe with the metatarsal, attaching the suture to the nail, and fastening the nail to the second portion. The nail includes an anchor portion for anchoring in the first portion, a head for attachment to a second portion, a passage for attachment of the suture, a first aperture for a fastener to attach the head with the first portion, and a second aperture for a fastener to attach the head with the second portion.
1. An implant nail for correcting a bunion formed at a joint between a metatarsal and a great toe, the implant nail comprising:
a monolithic body comprising:
a head at a first end of the monolithic body, the head having a bone-facing surface and an outer surface opposite the bone-facing surface, the head comprising:
a head first end including a shoulder;
a head second end;
a transverse bore extending along a superior-inferior axis of the head, the transverse bore disposed closer to the bone-facing surface than the outer surface; and
a first bone fixation hole extending through the head, the first bone fixation hole oriented along a first hole axis;
an anchor at a second end of the monolithic body; and
a neck disposed between the second head end and the anchor, the neck comprising
a second bone fixation hole extending through the neck, the second bone fixation hole oriented along a second hole axis, the second hole axis being off-axis from the first hole axis.
2. The implant nail of claim 1 , wherein an implant axis of the anchor forms a first angle with a head axis of the head, the first angle being less than 90°.
3. The implant nail of claim 2 , wherein the implant axis forms a second angle with the second hole axis, the second angle being between 30° and 60.
4. The implant nail of claim 3 , wherein the first angle between the implant axis and the head axis is in the range of 15° to 60°.
5. The implant nail of claim 3 , wherein the first hole axis is perpendicular to a plane defined by a lateral side of the head.
6. The implant nail of claim 3 , wherein the first and second angles are in a plane parallel with a superior side of the nail.
7. The implant nail of claim 3 , wherein the shoulder includes superior and inferior portions extending at right angles to respective superior and inferior sides of the neck.
8. The implant nail of claim 3 , wherein the second bone fixation hole is configured to receive a second fastener such that a head of the second fastener is fully recessed within the neck.
9. The implant nail of claim 3 , wherein the first and second angles are measured in a plane parallel with a superior view of the implant.
10. The implant nail of claim 1 , wherein the first bone fixation hole diverges away from the second bone fixation hole as the first bone fixation hole extends from the outer surface to the bone-facing surface.
11. The implant nail of claim 10 , wherein the transverse bore is disposed between the first and second bone fixation holes.
12. The implant nail of claim 11 , wherein the first and second bone fixation holes intersect each other at the outer surface.
13. The implant nail of claim 1 , wherein the first and second bone fixation holes are aligned with each other along a length of the implant nail.
14. The implant nail of claim 13 , wherein the first and second bone fixation holes are the only bone fixation holes of the implant nail.