Systems and methods for fusion of anatomical joints
The present disclosure relates to improved plate and screw systems for use in fusion and other surgical procedures, which improve the ability to effectively affix adjacent bodies without gapping or experiencing loss of compression over time. The systems include plates having armatures configured to receive bushings, the bushings configured to pivot and rotate and thereby permit a greater degree of orientation of corresponding screws placed through the bushings. In embodiments, the bushings comprise anti-rotation elements which lock the bushings in a desired orientation. Methods for use of the components described herein are also disclosed.
1. An orthopedic implant system, comprising:
a first plate fastener;
a second plate fastener;
a first armature fastener;
a second armature fastener;
a plate having a longitudinal axis in an x direction and having a first plate fastener aperture that receives the first plate fastener and a second plate fastener aperture that receives the second plate fastener, the plate defining a fusion area located between the first plate fastener and the second plate fastener;
a first armature extending away in an y-z direction having a first armature length from the plate longitudinal axis and a first armature fastener aperture that receives the first armature fastener that has a first armature fastener axis that extends away from the first armature fastener aperture in the direction of the fusion area;
a second armature extending away in the y-z direction having a second armature length from the plate longitudinal axis and having a second armature fastener aperture that receives the second armature fastener that has a second armature fastener axis that extends away from the second armature fastener aperture in the direction of the fusion area;
an extension stemming from the plate in a direction generally opposite the first armature, the extension having an extension armature configured to receive a distal end of the second armature fastener; and
wherein the first armature fastener axis and the second armature fastener axes converge, but do not intersect.
2. The orthopedic implant system as set forth in 1 , wherein the first armature aperture defines a plane that is not parallel to the plate longitudinal axis.
3. The orthopedic implant system as set forth in 2 , wherein the second armature aperture defines a plane that is not parallel to the plate longitudinal axis.
4. The orthopedic implant system as set forth in claim 2 , wherein the first armature defines an arc of more than 45 degrees relative to the plate longitudinal axis.
5. The orthopedic implant system as set forth in claim 4 , wherein the first armature defines an arc of more than 60 degrees relative to the plate longitudinal axis.
6. The orthopedic implant system as set forth in claim 5 , wherein the first armature defines an arc of more than 75 degrees relative to the plate longitudinal axis.
7. The orthopedic implant of claim 5 , wherein the first or the second armature are configured to flex in response to a force applied during implantation.
8. The orthopedic implant system as set forth in 1 , wherein one or more of the first and second plate fasteners and the first and second armature fasteners is a locking fastener.
9. The orthopedic implant system as set forth in claim 1 , wherein one or more of the first and second plate fasteners and the first and second armature fasteners is a polyaxial fastener.
10. The orthopedic implant system as set forth in claim 9 , wherein one or more of the first and second plate fasteners and the first and second armature fastener is a locking fastener.
11. The orthopedic implant of claim 1 , wherein the first plate fastener is a locking screw.
12. The orthopedic implant of claim 1 , wherein at least one of the first the second armature fastener is a polyaxial screw.
13. The orthopedic implant of claim 1 , wherein both of the first and the second armature fastener are a polyaxial screw.
14. The orthopedic implant of claim 12 , wherein the polyaxial screw has at least 40 degrees of conical freedom.
15. The orthopedic implant of claim 1 , wherein one of the first and the second armature fastener is only partially threaded to form a compression screw.