Calcaneus step plate
A calcaneus plate provided with two vertically-spaced plate sections, with corner-located screw holes. An intermediate wall connects the plate sections. An arcuate protrusion extends from the intermediate wall and contains an internal sliding mechanism for a compression screw. The sliding mechanism includes an arc-shaped compression hole with an elongated opening that includes a ridge upon with the compression screw head can slide.
1. A calcaneus step bone plate, comprising:
a first plate section and a second plate section extending about parallel to the first plate section;
an intermediate plate connecting the first and second plate sections and extending about perpendicular to the first and second plate sections; and
an arcuate protrusion extending away from the intermediate plate and in a direction about perpendicular to the intermediate plate, the arcuate protrusion comprising a truncated passage or through-hole for receiving a compression fixation device, the through-hole located about a middle of the arcuate protrusion and defining a sliding mechanism to allow the compression fixation device to both slide and rotate relative to the arcuate protrusion to achieve compression on a counter calcaneus cortex.
2. The bone plate of claim 1 , wherein the arcuate protrusion is integral to the intermediate plate.
3. The bone plate of claim 1 , wherein the compression fixation device is a compression screw.
4. The bone plate of claim 1 , wherein the truncated passage of the center sliding mechanism includes an inner outlet opening and an opposing outer inlet opening, wherein a cross section of the inner outlet opening is smaller than a cross section of the outer inlet opening.
5. The bone plate of claim 1 , wherein one of the first and second plate sections has a wedged profile.
6. The bone plate of claim 1 , wherein each of the first and second plate sections is provided with a plurality of apertures passing through the first and second plate sections.
7. The bone plate of claim 6 , wherein each of the apertures accommodates a fixation device.
8. The bone plate of claim 6 , wherein each of the apertures is located in a corner of the first and second plate sections.
9. The bone plate of claim 1 , wherein the plate has a stepped configuration.
10. A calcaneus step plate assembly for engagement with a calcaneus bone, comprising:
a calcaneus step plate positioned proximate to the calcaneus, the calcaneus step plate comprising:
a first plate and a second plate extending about parallel to the first plate;
an intermediate wall connecting the first and second plates and extending about perpendicular to the first and second plates, so that the first and second plates are symmetrically located relative to the intermediate wall and opposite to each other; and
an arcuate protrusion extending away from the intermediate wall and in a direction about perpendicular to the intermediate wall;
a compression fixation device for engagement with the through-hole of the truncated passage and with the calcaneus; and
at least one fixation device for securing the first and second plates to the calcaneus, wherein the arcuate protrusion includes a truncated passage or through-hole, the through-hole located about a middle of the arcuate protrusion and defining a sliding mechanism to allow the compression fixation device to both slide and rotate relative to the arcuate protrusion to achieve compression on a counter calcaneus cortex.
11. The plate assembly of claim 10 , wherein one of the first and second plates has a uniform height and the other one of the first and second plates has a gradual height with a wedged profile.
12. The plate assembly of claim 10 , wherein the compression fixation device is a screw that slides and rotates within the through-hole.
13. A method of calcaneus repair, comprising the steps of:
providing a calcaneus step plate having a body with a first plate and a second plate extending about parallel to the first plate; an intermediate plate connecting the first and second plates and extending about perpendicular to the first and second plates; and an arcuate protrusion extending away from the intermediate plate and in a direction about perpendicular to the intermediate plate;
positioning the calcaneus step plate proximal to the calcaneus; and
securing the calcaneus step plate to the calcaneus by providing a compression fixation device through a through-hole in the arcuate protrusion, wherein the arcuate protrusion is provided with a center sliding mechanism located at about a middle of the protrusion, to allow the compression fixation device to both slide and rotate relative to the arcuate protrusion to achieve compression on a counter calcaneus cortex.
14. The method of claim 13 , wherein the step of securing the calcaneus step plate to the calcaneus further comprises the steps of:
providing a pair of through-holes through each of the first and second plates; and
securing a fixation device through each of the through-holes of the first and second plates, and into the calcaneus.
15. The method of claim 14 , wherein the fixation device is selected from the group consisting of a washer, a screw and an anchor.