Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
During extension (left) the interpedicular screw distance must decrease, requiring compression of the polycarbonate urethane (PCU) section between the screws. During flexion (right), the interpedicular screw distance must increase, requiring elongation of the device through compression of the opposite PCU section.
