Abstract: Various implementations described herein include a screw locking receiver. The screw locking receiver includes a receiver frame which has a first surface, a second surface opposite and spaced apart from the first surface, and an inner surface which extends between the first surface and the second surface. The receiver frame defines a cylindrical inner channel having a central axis. The receiver includes a counterbore which extends along a first portion of the inner surface. The receiver includes a plurality of threads extending helically about a second portion of the inner surface. The counterbore has a diameter that is sufficient to accept a screw head having a non-parallel central axis with respect to a central axis of the inner channel when in a fastened position.

Abstract: Various implementations described herein include a screw locking receiver. The screw locking receiver includes a receiver frame which has a first surface, a second surface opposite and spaced apart from the first surface, and an inner surface which extends between the first surface and the second surface. The receiver frame defines a cylindrical inner channel having a central axis. The receiver includes a counterbore which extends along a first portion of the inner surface. The receiver includes a plurality of threads extending helically about a second portion of the inner surface. The counterbore has a diameter that is sufficient to accept a screw head having a non-parallel central axis with respect to a central axis of the inner channel when in a fastened position.

Abstract: An embodiment includes a bone fixation system comprising: a plate; and a tool; wherein: (a) the plate includes a hole to receive a bone anchor, (b) the hole includes a shelf, (c) the shelf includes a number of recesses; and (d) the hole is unthreaded and includes no resilient parts; wherein: (a) a distal end of the tool includes one or more lobes, (b) a number of lobes is no greater than the number of recesses, (c) each of the one or more lobes is configured to mate with one of the recesses. Other embodiments are described herein.

Abstract: Various implementations described herein include a screw locking receiver. The screw locking receiver includes a receiver frame which has a first surface, a second surface opposite and spaced apart from the first surface, and an inner surface which extends between the first surface and the second surface. The receiver frame defines a cylindrical inner channel having a central axis. The receiver includes a counterbore which extends along a first portion of the inner surface. The receiver includes a plurality of threads extending helically about a second portion of the inner surface. The counterbore has a diameter that is sufficient to accept a screw head having a non-parallel central axis with respect to a central axis of the inner channel when in a fastened position.

Abstract: An embodiment includes a bone fixation system comprising: a plate; and a tool; wherein: (a) the plate includes a hole to receive a bone anchor, (b) the hole includes a shelf, (c) the shelf includes a number of recesses; and (d) the hole is unthreaded and includes no resilient parts; wherein: (a) a distal end of the tool includes one or more lobes, (b) a number of lobes is no greater than the number of recesses, (c) each of the one or more lobes is configured to mate with one of the recesses. Other embodiments are described herein.