System for stabilization of fractures of convex articular bone surfaces including subchondral support structure

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.