A spinal fixation device includes a housing assembly and a bone screw. The housing assembly includes an inner housing and an outer housing selectively slidable relative to each other between a locked position and an unlocked position. The bone screw includes a head portion selectively securable within the inner housing of the housing assembly, a neck portion, and an elongated body portion including a proximal region and a distal region. The distal region includes a threaded section having threads and an unthreaded section extending distally from the threaded section and terminating at a distal tip. The threaded section includes a cutting flute defined therein proximal to the unthreaded section.
