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. Physiological concavity between tubercles (white arrows: tubercles). B. Pseudo-concavity formed by osteophytes (white arrows: osteophytes). C. Small cortical interruption or vascular channel (white arrow: vascular channel).
