Bone plates having polygonal locking holes with thread interruption, and related systems and methods

A bone fixation system, comprising:

• a bone plate that defines an outer surface, a bone-facing surface opposite the outer surface, and an interior surface that defines a hole extending from the outer surface to the bone-facing surface along a central hole axis, wherein the interior surface further defines:
• plate threads extending between the outer surface and the bone-facing surface;
• first, second, and third columns sequentially located about the central hole axis;
• a first corner extending tangentially from a first side of the second column to a second side of the first column;
• a second corner extending tangentially from a second side of the third column to a first side of the first column, wherein the first corner and the second corner are substantially equidistantly spaced from the central hole axis at a first distance measured along a radial direction perpendicular to the central hole axis, and the plate threads extend across the first, second, and third columns and across the first corner and the second corner;
• and
• a recess located between the second and third columns and facing the first column, wherein an apex of the recess is spaced from the central hole axis at a second distance that is greater than the first distance, such that the recess circumferentially interrupts at least a portion of a thread-form of at least one of the plate threads;
• and
• an instrument having a distal mounting portion, wherein the distal mounting portion includes a first formation configured to mate with the hole, and a protrusion extending outwardly from the first formation, wherein the protrusion and the recess define complimentary geometries, such that the protrusion is configured to mate with the recess in a manner securing the first formation with the hole.