System for stabilization of fractures of convex articular bone surfaces including subchondral support structure
View Patent ↗A fracture fixation system is provided for a fracture of a head portion of a long bone which has subchondral bone defining a convex articular surface, and particularly the proximal humerus. The system includes a plate element positionable on the long bone substantially opposite the head portion of the long bone and on a first side of the fracture, and a post element extending from the plate and into the head portion and across the fracture.
1. A plate for a bone fracture fixation system, comprising:
a head portion and shaft portion, a bone contacting first surface, and an opposite second surface, said shaft portion defining a longitudinal axis,
said head portion provided with six post holes and a K-wire hole substantially smaller in diameter than any of said six post holes and located at a center relative to an arrangement of said six post holes, said K-wire hole having a longitudinally central axis,
four of said six post holes being located at the corners of a rectangular quadrilateral and having fixed axes that are divergent in a first direction parallel with said longitudinal axis and divergent in a second direction perpendicular to said first direction such that when said plate is positioned on the bone said fixed axes of said four post holes extend beneath said first surface of said plate and are limited to only diverge in said first and second directions into the bone, and
and two of said six post holes being located outside said quadrilateral along an axis parallel to said axis which laterally bisects said rectangular quadrilateral, said two post holes having fixed axes that are convergent toward a portion of said central axis of said K-wire hole such that when said plate is positioned on the bone said fixed axes of said two post holes extend beneath said first surface of said plate and into the bone.
2. A plate according to claim 1 , wherein:
said head portion is angled relative to said shaft portion such that said head portion extends through a different plane than said shaft portion,
said head portion has a curved posterior side and a straight anterior side, and said shaft portion has a straight anterior side, such that said anterior sides of said head and shaft portions define a co-extensive straight line.
3. A plate according to claim 1 , further comprising:
a plurality of suture supports arranged about said head portion, said suture supports being elevated relative to said lower surface of said head portion.
4. A plate according to claim 3 , wherein:
said suture supports are discrete from each other.
5. A plate according to claim 4 , wherein:
said suture supports are substantially radially arranged about a point on said head portion.
6. A plate according to claim 1 , wherein:
said shaft portion has a bone contacting first surface, an opposite second surface, a thickness between said first and second surface, and a width transverse to said thickness, wherein said width is greater than said thickness, and a plurality of screw holes extending completely through said thickness of said plate.