Why does the TriGen screw have an expanded thread near the head?
It is not uncommon to unintentionally overdrill the near cortex due to a “wobble” effect often associated with using power drills. The TriGen screw was designed with expanded threads at the head to enhance bony purchase at the near cortex. The optimal size of the expanded threads was determined by balancing maximum bony purchase while minimizing the risk of micro-fractures.
