Orthopedic locking screw

An orthopedic locking screw comprising:

• a shaft including a thread pattern section over at least part of the shaft,
• the thread pattern section including a helical crest and a helical root, a first part of the helical crest defining a first thread in a first direction and a second part of the helical crest defining a second thread in a second direction opposite the first direction, the first part being separate from the second part,
• wherein the helical crest has a first minimum height relative to the helical root at the first part and a second minimum height relative to the helical root at the second part, the first minimum height being greater than the second minimum height, and the second minimum height being greater than zero, and
• wherein the second part includes a plurality of second subparts, each of the plurality of second subparts including a circumferentially planar surface, a first tapered surface and a second tapered surface, the circumferentially planar surface-extending from a leading edge to a trailing edge, the leading edge and the trailing edge both being at an oblique angle relative to a longitudinal axis of the helical crest, the first tapered surface being in between the first part of the helical crest and the leading edge along the longitudinal axis, and the second tapered surface being in between the trailing edge and the first part of the helical crest along the longitudinal axis.

An orthopedic locking screw comprising:

• a shaft including a thread pattern section over at least part of the shaft,
• the thread pattern section including a first thread in a first direction and a second thread in a second direction opposite the first direction, the second thread being entirely within the first thread such that the second thread is defined by a plurality of recessed portions in the first thread,
• wherein the first thread includes a crest centered along a first central longitudinal axis of the first thread extending helically about the shaft,
• wherein each of the plurality of recessed portions includes a first edge, a second edge and a surface therebetween, the first edge and the second edge being on opposite sides of the first central longitudinal axis of the first thread and the surface being at a substantially uniform distance from a second central longitudinal axis of the shaft from a leading edge of the surface to a trailing edge of the surface, and
• wherein each of the plurality of recessed portions is asymmetrical about a plane substantially aligned with and passing through the first central longitudinal axis and the shaft.