Patella bone plate and methods of fixation
A patella fracture fixation system includes a bone plate that is configured to be implanted along an anterior approach. The bone plate has a fixation hub and a plurality of fixation nodes that are connected to the fixation hub. The fixation hub and the fixation nodes can define respective fixation holes. The bone plate can further include legs that are configured to be bent around respective inferior aspects of the patella.
1. A patella bone plate comprising:
a fixation body including:
a fixation hub having an inner surface configured to face a patella bone and an outer surface opposite the inner surface, and an array of fixation holes that extend through the fixation hub from the inner surface to the outer surface; and
a plurality of fixation nodes that extend radially out from the fixation hub, each of the plurality of fixation nodes defining a respective fixation hole,
wherein the fixation body defines a plurality of apertures that extend through the fixation hub from the outer surface to the inner surface, wherein the apertures are elongate along respective central axes that 1) intersect each other and 2) are tangential to a common circle that is centered about a geometric center of the fixation hub.
2. The patella bone plate as recited in claim 1 , wherein the apertures are dog bone shaped.
3. The patella bone plate as recited in claim 1 , wherein the apertures are circumferentially equidistantly spaced from each other.
4. The patella bone plate as recited in claim 1 , wherein the array is a first array, and the fixation hub further comprises a second array of holes that is disposed radially outward with respect to the first array.
5. The patella bone plate as recited in claim 4 , wherein the holes of the second array are alternatingly arranged with the fixation holes of the first array.
6. The patella bone plate as recited in claim 1 , wherein each of the fixation nodes defines a respective eyelet that, in turn, defines the respective fixation hole.
7. The patella bone plate as recited in claim 1 , further comprising a plurality of arms that extend radially outward from the fixation hub to a respective one of the fixation nodes.
8. The patella bone plate as recited in claim 1 , further comprising a plurality of pairs of arms, wherein each of the pairs of arms extends radially outward from the fixation hub to a respective one of the fixation nodes.
9. The patella bone plate of claim 8 , wherein first and second arms of each pair of arms converge toward each other as they extend from the fixation hub to the respective one of the fixation nodes.
10. The patella bone plate of claim 1 , wherein the nodes are equidistantly spaced circumferentially about the fixation hub.
11. The patella bone plate as recited in claim 1 , wherein the fixation holes of the array of fixation holes and of the nodes are variable angle fixation holes.
12. The patella bone plate as recited in claim 1 , wherein the fixation body is preformed such that the inner surface is concave.
13. The patella bone plate as recited in claim 1 , wherein respective geometric centers of the apertures lie on the common circle.