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.
A sterilely draped power instrument being used to advance the trochar through the dense cortical bone (left PSIS) into the medullary cavity of the posterior iliac crest. Needle trajectory should be perpendicular to the PSIS. (PSIS, posterior superior iliac spine.)
