Expandable screw and methods of use

An expandable screw comprising:

• a shaft having central lumen extending along a longitudinal axis of the shaft, the shaft having a proximal portion opposite a distal portion and an expandable region disposed between the proximal portion and distal portion, the shaft having an outer surface including a thread to engage bone, the expandable region configurable between a first state with a first radius measured from the longitudinal axis to the outer surface and a second state having a second radius measured from the longitudinal axis to the outer surface;
• a head coupled with the shaft at a neck configured to receive a driving instrument to insert and drive the shaft into the bone when the expandable region is in the first state;
• and
• a slit generally spiraling along the shaft and extending radially inwardly from the outer surface to the center post so as to define a cut pattern on the shaft that permits at least partial nesting of a first portion of the expandable region within a second portion of the expandable region in the second state.