Adjustable angle bone fixation assembly

A bone fixation assembly for joining bone fusions, comprising:

• a bone fusion plate comprising one or more fixation apertures configured to receive a bone fixation screw and one or more aperture threads, wherein the bone fixation screw is configured to be coupled with the fixation aperture at an oblique angle with respect to the bone fusion plate;
• the bone fixation screw comprising a head portion comprised of a superior end and an inferior end, the head portion comprising one or more proximal threads extending circumferentially around and within the head portion;
• the inferior end configured to threadably countersink within a fixation aperture of the bone fusion plate;
• the one or more proximal threads configured to threadably couple with the one or more aperture threads;
• the superior end of the head portion of the bone fixation screw comprising a shaped opening, wherein the greatest diameter of the shaped opening is axially oriented between a multiplicity of uniformly disposed slots, wherein the slots are configured to allow adjacent proximal threads to disengage from a first aperture thread engaged along a countersunk side of the head portion, and engage a second aperture thread along a protruding side of the head portion, as the bone fixation screw is turned in a respective fixation aperture;
• wherein the shaped opening coincides with a disposition of the multiplicity of slots;
• wherein the proximal threads are configured to cross-thread with aperture threads of the bone fusion plate when the bone fixation screw is utilized;
• the shaped opening comprising one or more peripheral regions axially oriented between the slots and configured to engagedly receive a tool suitable for driving the bone fixation screw into a bone hole;
• a shank extending from the inferior end and comprising distal threads;
• wherein a portion of the distal threads extends past a region formed by at least one of the multiplicity of uniformly disposed slots;
• a tapered portion of the shank extending to a rounded distal end comprising a plurality of one or more flutes that extend along the shank adjacent of the rounded distal end and into the distal threads;
• each flute corresponding to and bordering a cutting edge, wherein the cutting edge borders each of the one or more flutes;
• and
• is configured to clean an interior of the bone hole and increase a diameter of the bone hole to accept the distal threads of the bone fixation screw;
• and
• wherein the one or more aperture threads and the one or more proximal threads share a substantially similar thread pitch, whereby a level of protrusion of the head portion above the bone fusion plate is limited, thereby minimizing irritation to soft tissue.